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Philips SC28L91 2004 Oct 21 7, Figure 2. Block Diagram (68XXX mode)

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Philips Semiconductors Product data sheet

SC28L91

3.3 V or 5.0 V Universal Asynchronous

Receiver/Transmitter (UART)

2004 Oct 21 7

D0–D7

R/WN

CEN

A0–A3

RESETN

INTRN

X1/CLK

BUS BUFFER

OPERATION CONTROL

ADDRESS

DECODE

R/W CONTROL

INTERRUPT CONTROL

IMR

ISR

TIMING

BAUD RATE

GENERATOR

CLOCK

SELECTORS

COUNTER/

TIMER

XTAL OSC

CSR

ACR

CTL

DATA CHANNEL

16 BYTE TRANSMIT

FIFO

TRANSMIT

SHIFT REGISTER

16 BYTE RECEIVE

FIFO

MRA0, 1, 2

CRA

SRA

INPUT PORT

CHANGE OF

STATE

DETECTORS (4)

OUTPUT PORT

FUNCTION

SELECT LOGIC

OPCR

TxDA

RxDA

IP0-IP5

OP0-OP7

VCC

VSS

CONTROL

TIMING

INTERNAL DATABUS

IPCR

ACR

OPR

CTU

WATCH DOG TIMER

RECEIVE SHIFT

SD00703

IVR

DACKN

IACKN

Figure 2. Block Diagram (68XXX mode)

Contents

Main SC28L91 DESCRIPTION FEATURES Page 2004 Oct 21 4 PIN CONFIGURATION DIAGRAM 80XXX PIN CONFIGURATION Note: Pins marked No Connection must NOT be connected. SD00699 SD00698 3.3 V or 5.0 V Universal Asynchronous 2004 Oct 21 5 PIN CONFIGURATION DIAGRAM 68XXX PIN CONFIGURATION Note: Pins marked No Connection must NOT be connected. SD00701 2004 Oct 21 6 SD00702 Figure 1. Block Diagram (80XXX mode) 2004 Oct 21 7 SD00703 Figure 2. Block Diagram (68XXX mode) SC28L91 PIN CONFIGURATION FOR 80XXX BUS INTERFACE (INTEL) SC28L91 PIN CONFIGURATION FOR 68XXX BUS INTERFACE (MOTOROLA) ABSOLUTE MAXIMUM RA TINGS DC ELECTRICAL CHARACTERISTICS AC CHARACTERISTICS (5 VOL T) Page AC CHARACTERISTICS (3.3 VOL T) Page Block Diagram Data Bus Buffer Operation Control Interrupt Control TIMING CIRCUITS Crystal Clock BRG Counter/Timer Timer Mode Counter Mode Timeout Mode Time Out Mode Caution Communications Input Port Output Port OPERATION Transmitter Receiver Transmitter Reset and Disable Receiver FIFO Receiver Status Bits Receiver Reset and Disable Watchdog Receiver Time-out Mode Watchdog and Time Out Mode Differences Multi-drop Mode (9-bit or Wake-Up) PROGRAMMING Table 1. SC28L91 register addressing Table 2. Condensed Register bit formats REGISTER DESCRIPTIONS MODE REGISTERS MR0 Mode Register 0 Table 3. Receiver FIFO Table 3a. Receiver FIFO Table 4. Transmitter FIFO MR1 Mode Register 1 MR2 Mode Register 2 Page CSR CLOCK SELECT REGISTER T able 5. Table 6. Bit rate generator characteristics for Crystal or Clock = 3.6864MHz CRCommand Register CR COMMAND REGISTER SC28L91 SR Status Register OPCR Output Port Configuration Register SOPRSet the Output Port Bits (OPR) ROPRReset Output Port Bits (OPR) OPR Output Port Register ACR Auxiliary Control Register ACRAuxiliary Control Register Table 7. ACR 6:4 field definition IPCR Input Port change Register ISRInterrupt Status Register ISR Interrupt Status Register IMRInterrupt Mask Register IMR Interrupt Mask Register IVR/GP Interrupt Vector Register (68k mode) or Generalpurpose register (80XXX mode) CTPU and CTPL Counter/Timer Registers CTPU Counter Timer Preset Upper CTPL Counter Timer Preset Low Output Port Notes The CTS, RTS, CTS Enable Tx signals 2004 Oct 21 33 SD00696 80XXX Mode 68XXX Mode Figure 4. Reset Timing SD00087 2004 Oct 21 34 Figure 6. Bus Timing (Read Cycle) (68XXX mode) 2004 Oct 21 35 Figure 8. Interrupt Cycle Timing (68XXX mode) Figure 9. Port Timing 2004 Oct 21 36 SD00136 Figure 11. Clock Timing SD00704 Figure 10. Interrupt Timing (80xxx mode) 2004 Oct 21 37 SD00138 Figure 14. Transmitter Timing Figure 12. Transmitter External Clocks SD00139 2004 Oct 21 38 SD00156 Figure 16. Wake-Up Mode Figure 15. Receiver Timing SD00096 Page Page Page REVISION HISTOR Y Definitions Disclaimers Contact information Data sheet status