MC68340 datasheet(332/441 Pages) FREESCALE

332 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

7- 37

OP0—Output Port 0/

RTSA

1 = The OP0/

RTSA pin functions as the ready-to-send signal for channel A. The

signal is asserted and negated according to the configuration programmed by

RxRTS bit 7 in the MR1A for the receiver and TxRTS bit 5 in the MR2A for the

transmitter.

0 = The OP0/

RTSA pin functions as a dedicated output. The signal reflects the

complement of the value of bit 0 of the OP.

7.4.1.16 OUTPUT PORT DATA REGISTER (OP). The bits in the OP register are set by

performing a bit set command (writing to offset $71E) and are cleared by performing a bit

reset command (writing to offset $71F). This register can only be written when the serial

module is enabled (i.e., the STP bit in the MCR is cleared).

Bit Set

$71E

76543210

OP7

OP6

OP5

OP4

OP3

OP2

OP1

OP0

RESET:

00000000

Write Only

Supervisor/User

NOTE

OP bits 7, 5, 3, and 2 are not pinned out on the MC68340;

thus, changing these bits has no effect.

OP6, OP4, OP1, OP0—Output Port Parallel Outputs

1 = These bits can be set by writing a one to the bit position(s) at this address.

0 = These bits are not affected by writing a zero to this address.

Bit Reset

$71F

76543210

OP7

OP6

OP5

OP4

OP3

OP2

OP1

OP0

RESET:

00000000

Write Only

Supervisor/User

NOTE

OP bits 7, 5, 3, and 2 are not pinned out on the MC68340;

thus, changing these bits has no effect.

OP6, OP4, OP1, OP0—Output Port Parallel Outputs

1 = These bits can be cleared by writing a one to the bit position(s) at this address.

0 = These bits are not affected by writing a zero to this address.

Freescale Semiconductor, Inc.

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