OB38R08T1W24SP

OB38R08T1 8-Bit Micro-controller with 8KB+1KB Programmable ROM & 256B+256B RAM embedded Product List ................................................................................................................................................................................... 4 Description .................................................................................................................................................................................... 4 Ordering Information ..................................................................................................................................................................... 4 Features ........................................................................................................................................................................................ 4 Pin Configuration .......................................................................................................................................................................... 5 Block Diagram ............................................................................................................................................................................... 8 Pin Description .............................................................................................................................................................................. 9 Special Function Register (SFR)................................................................................................................................................. 11 Function Description ................................................................................................................................................................... 16 1. General Features ............................................................................................................................................................... 16 1.1 Embedded Programmable ROM ............................................................................................................................... 16 1.2 IO Pads ...................................................................................................................................................................... 16 1.3 Instruction timing Selection ........................................................................................................................................ 16 1.4 Clock Out Selection ................................................................................................................................................... 17 1.5 RESET ....................................................................................................................................................................... 17 1.5.1 Hardware RESET function .................................................................................................................................... 17 1.5.2 Software RESET function ...................................................................................................................................... 17 1.5.3 Reset status .......................................................................................................................................................... 18 1.5.4 Time Access Key register (TAKEY) ....................................................................................................................... 18 1.5.5 Software Reset register (SWRES) ........................................................................................................................ 19 1.5.6 Example of software reset ..................................................................................................................................... 19 1.6 Clocks ........................................................................................................................................................................ 19 2. Instruction Set .................................................................................................................................................................... 20 3. Memory Structure ............................................................................................................................................................... 24 3.1 Program Memory ....................................................................................................................................................... 24 3.2 Data Memory ............................................................................................................................................................. 25 3.3 Data memory - lower 128 byte (00h to 7Fh) .............................................................................................................. 25 3.4 Data memory - higher 128 byte (80h to FFh) ............................................................................................................ 25 3.5 Data memory - Expanded 256 bytes ( 00 to FF) .................................................................................................... 25 4. CPU Engine ........................................................................................................................................................................ 26 4.1 Accumulator ............................................................................................................................................................... 26 4.2 B Register .................................................................................................................................................................. 26 4.3 Program Status Word ................................................................................................................................................ 27 4.4 Stack Pointer .............................................................................................................................................................. 27 4.5 Data Pointer ............................................................................................................................................................... 28 On-Bright Electronics Confidential Datasheet ISSFD-M124 OB DOC DS OB38R08T1 A - 1 - OB38R08T1 8-Bit Micro-controller with 8KB+1KB Programmable ROM & 256B+256B RAM embedded 4.6 Clock control register ................................................................................................................................................. 28 4.7 Interface control register ............................................................................................................................................ 29 5. GPIO................................................................................................................................................................................... 30 6. Timer 0 and Timer 1 ........................................................................................................................................................... 32 6.1 Timer/counter mode control register (TMOD)............................................................................................................ 32 6.2 Timer/counter control register (TCON) ...................................................................................................................... 33 6.3 ENHance Interrupt Type Register (ENHIT) ............................................................................................................... 34 6.4 External Interrupt Deglitch Register (INTDEG) ......................................................................................................... 34 6.5 Peripheral Frequency control register ....................................................................................................................... 35 6.6 Mode 0 (13-bit Counter/Timer) .................................................................................................................................. 35 6.7 Mode 1 (16-bit Counter/Timer) .................................................................................................................................. 36 6.8 Mode 2 (8-bit auto-reload Counter/Timer) ................................................................................................................. 36 6.9 Mode 3 (Timer 0 acts as two independent 8 bit Timers / Counters) .......................................................................... 37 7. Timer 2 and Capture Compare Unit ................................................................................................................................... 38 7.1 Timer 2 function ......................................................................................................................................................... 41 7.1.1 Timer mode ........................................................................................................................................................... 41 7.1.2 Event counter mode .............................................................................................................................................. 42 7.1.3 Gated timer mode.................................................................................................................................................. 43 7.1.4 Reload of Timer 2 .................................................................................................................................................. 43 7.2 Compare function ...................................................................................................................................................... 43 7.2.1 Compare Mode 0 ................................................................................................................................................... 43 7.2.2 Compare Mode 1 ................................................................................................................................................... 44 7.3 Capture function ........................................................................................................................................................ 45 7.3.1 Capture Mode 0 (by Hardware) ............................................................................................................................. 45 7.3.2 Capture Mode 1(by Software) ............................................................................................................................... 45 8. Serial interface ................................................................................................................................................................... 47 8.1 Serial interface ........................................................................................................................................................... 48 8.1.1 Mode 0 .................................................................................................................................................................. 48 8.1.2 Mode 1 .................................................................................................................................................................. 49 8.1.3 Mode 2 .................................................................................................................................................................. 50 8.1.4 Mode 3 .................................................................................................................................................................. 50 8.2 Multiprocessor Communication of Serial Interface .................................................................................................... 51 8.3 Peripheral Frequency control register ....................................................................................................................... 51 8.4 Baud rate generator ................................................................................................................................................... 51 8.4.1 Serial interface modes 1 and 3 ............................................................................................................................. 51 On-Bright Electronics Confidential Datasheet ISSFD-M124 OB DOC DS OB38R08T1 A - 2 -