MK68564 datasheet(3/46 Pages) STMICROELECTRONICS

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SIO PIN DESCRIPTION (continued)

RxCA, RxCB :

Receiver Clocks (input/output). Programmable pin, receive clock input, or baud rate

generator output. The inputs are Schmit-trigger buffered to allow slow rise-time input

signals.

TxCA, TxCB :

Transmitter Clocks (input/output). Programmable pin, transmit clock input, or baud rate

generator output. The inputs are Schmit-trigger buffered to allow slow rise-time input

signals.

RTSA, RTSB :

Request to Send (outputs, active low). These outputs follow the inverted state

programmed into the RTS bit. When the RTS bit is reset in the asynchronous mode, the

output will not change until the character in the transmitter is completely shifted out.

These pins may be used as general purpose outputs.

DTRA, DTRB :

Data Terminal Ready (outputs, Active low). These outputs follow the inverted state

programmed into the DTR bit. These pins may also be used as general purpose

outputs.

SYNCA, SYNCB :

Synchronization (input/output, active low). The SYNC pin is an output when Monosync,

Bisync, or SDLC mode is programmed. It is asserted when a sync/flag character is

detected by the receiver. The SYNC pin is a general purpose input in the Asynchronous

mode and an input to the receiver in the External Sync Mode.

Figure 1a : Dual In Line Pin Configuration.

Figure 1b : Chip Carrier Pin Configuration.

MK68564

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