SC28L202A1DGG,129

INTEGRATED CIRCUITS SC28L202 Dual universal asynchronous receiver/transmitter (DUART) Product data sheet 2005 Nov 01 Supersedes data of 2004 Apr 16 Philips Semiconductors Product data sheet Dual universal asynchronous receiver/transmitter SC28L202 (DUART) DESCRIPTION . 1 FEATURES 1 ORDERING INFORMATION 2 PIN CONFIGURATIONS . 2 PIN CONFIGURATION FOR 80XXX BUS INTERFACE (INTEL) . 3 CONFIGURATION FOR 68XXX BUS INTERFACE (MOTOROLA) . 4 OVERALL DESCRIPTION . 5 BRIEF DESCRIPTION OF FUNCTIONAL BLOCKS . 5 Bus Interface . 5 Timing Circuits 5 I/O ports . 5 UARTs . 5 Transmitters and Receivers . 5 Character and Address Recognition 6 Flow Control 6 Test Modes and Software . 6 DETAILED DESCRIPTIONS . 6 Bus Interface . 6 Timing Circuit . 7 I/O Ports . 8 UART Operation . 8 Receiver Operation 9 Arbitrating Interrupt Structure 12 PROGRAMMING THE HOST INTERFACE . 17 REGISTER DESCRIPTION AND PROGRAMMING NOTE 18 Registers that control Global Properties of the 28L202 . 18 GCCR Global Configuration Control Register 18 GCCR(7:6) DACKN Assertion . 18 GCCR(5:3): Reserved 18 GCCR(2:1): Interrupt vector configuration . 18 GCCR(0): Interrupt Status Masking 18 SFSR A and B Special Feature & Status Register 19 SFSR(7:4) Reserved . 19 SFSR(3) Status of loop back error check 19 SFSR(0) Reserved 19 TRR Test and Revision Register . 19 TRR 7 Test 2 Enable 19 TRR 6:0 Chip Revision Code . 19 STCR Scan Test Control Register 19 SES System Enable Status Register, A and B . 19 EOS Enhanced Operation Status Register 19 UART Registers 20 These registers are generally concerned with formatting, transmitting and receiving data . 20 MR0 Mode Register 0, A and B 20 MR0 7 Fixed length Watchdog Timer 20 MR0 5:4 Tx interrupt fill level 20 MR0 3 FIFO Size 20 MR0 2:0 Legacy Baud Rate Group Selection 20 MR1 Mode Register 1, A and B 21 MR1 7 Receiver Request to Send (hardware flow control) . 21 MR1 6 Receiver interrupt control bit 1 . 21 MR1 5 Error Mode Select and sub modes 21 MR1 4:3 Parity Mode Select 21 MR1 2 Parity Type Select . 21 MR1 1:0 Bits per Character Select . 21 MR2 Mode Register 2, A and B 22 MR2 7:6 Mode Select 22 MR2 7:6 = b00 Normal Mode . 22 MR2 7:6 = b01 Automatic Echo . 22 MR2 7:6 = b10 selects local loop back diagnostic mode. In this mode: . 22 MR2 7:6 = b11 Selects the Remote Loop back diagnostic mode. In this mode: 22 MR2 5 Transmitter Request to Send Control 22 MR2 4 Clear to Send Control . 22 MR2 3:0 Stop Bit Length Select . 22 i 2005 Nov 01