MC68340 datasheet(331/441 Pages) FREESCALE

331 / 441 page

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MC68340 USER’S MANUAL

MOTOROLA

7.4.1.15 OUTPUT PORT CONTROL REGISTER (OPCR). The OPCR individually

configures four bits of the 8-bit parallel OP for general-purpose use or as an auxiliary

function serving the communication channels. This register can only be written when the

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

OPCR

$71D

76543210

OP7

≈RDYB

OP6

≈RDYA

OP5

≈RDYB

OP4

≈RDYA

OP3

OP2

OP1

RTSB

OP0

RTSA

RESET:

00000000

Write Only

Supervisor/User

NOTE

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

changing bits 7, 5, 3, and 2 of this register has no effect.

OP6—Output Port 6/

≈RDYA

1 = The OP6/

≈RDYA pin functions as the transmitter-ready signal for channel A.

The signal reflects the complement of the value of bit 2 of the SRA; thus,

≈RDYA is a logic zero when the transmitter is ready.

0 = The OP6/

≈RDYA pin functions as a dedicated output. The signal reflects the

complement of the value of bit 6 of the OP.

OP4—Output Port 4/

≈RDYA

1 = The OP4/

≈RDYA pin functions as the FIFO-full or receiver-ready signal for

channel A (depending on the value of bit 6 of MR1A). The signal reflects the

complement of the value of ISR bit 1; thus,

≈RDYA is a logic zero when the

receiver is ready.

0 = The OP4/

≈RDYA pin functions as a dedicated output. The signal reflects the

complement of the value of bit 4 of the OP.

OP1—Output Port 1/

RTSB

1 = The OP1/

RTSB pin functions as the ready-to-send signal for channel B. The

signal is asserted and negated according to the configuration programmed by

RxRTS bit 7 in the MR1B for the receiver and TxRTS bit 5 in the MR2B for the

transmitter.

0 = The OP1/

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

complement of the value of bit 1 of the OP.

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