Contents
Main
SCC2691Universal asynchronous receiver/transmitter (UART)
DESCRIPTION
FEATURES
ORDERING INFORMATION
Figure 2. Block Diagram
COMMERCIAL INDUSTRIAL PACKAGES VCC = +5V +10%, TA = 0C to +70CVCC = +5V +10%,
BLOCK DIAGRAM
SD00123
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
SCC2691Universal asynchronous receiver/transmitter (UART)
AC ELECTRICAL CHARACTERISTICS
BLOCK DIAGRAM
SCC2692, SCC68681 and SCC2698B
Data Bus Buffer
Extended baud rates for SCN2681, SCN68681, SCC2691,
Interrupt Control
Receiver and Transmitter
RECEIVER FIFO
Receiver Status Bits
Receiver Reset and Disable
SCC2691Universal asynchronous receiver/transmitter (UART)
MULTI-PURPOSE INPUT PIN
MULTI-PURPOSE OUTPUT PIN
REGISTERS
MR1 Mode Register 1
MR2 Mode Register 2
Table 2. Register Bit Formats
MR2 (Mode Register 2) Channel Mode TxRTS Control CTS Enable
Tx Stop Bit Length*
CSR (Clock Select Register)
Extended baud rates for SCN2681, SCN68681, SCC2691, SCC2692, SCC68681 and SCC2698B
Table 2. Register Bit Formats (Continued)
CTUR (Counter/Timer Upper Register)
CSR Clock Select Register (see Table 6. also) Table 3. Baud Rate Selection
Extended baud rates for SCN2681, SCN68681, SCC2691, SCC2692, SCC68681 and SCC2698B
CR Command Register
SR Channel Status Register
ACR Auxiliary Control Register
Table 4. ACR[6:4] Operating Mode
Table 5. BRG Characteristics
ISR Interrupt Status Register
IMR Interrupt Mask Register
CTUR and CTLR Counter/Timer Registers
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2006 Aug 04 18
SD00128
Figure 11. Receiver Timing
Figure 10. Transmitter Timing
SD00129
The CTS, RTS, CTS Enable Tx signals
Transmitter Disable Note
Table 6. Baud Rates Extended
Extended baud rates for SCN2681, SCN68681, SCC2691, SCC2692, SCC68681 and SCC2698B
Receiver Reset in the Normal Mode (Receiver Enabled)
Receiver Reset in the Wake-Up Mode (MR1[4:3] = 11)
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