6/24

¡ Semiconductor

MSM66585/586/587/P587/Q587

PIN DESCRIPTIONS (Continued)

Symbol

Type

Description

P6_0/INT0

P6_1/INT1

P6_2/RXD1

P6_3/TXD1

P6_4/RXC1

P6_5/TXC1

Port 6 is 6 input/output pins. Input or output can be specified for each bit with the

Port 6 Mode Register (P6IO).

P6_0-P6_5 also have a secondary function as input/output pins for internal operation.

Their secondary function can be set for each bit with the Port 6 Secondary Function

Control Register (P6SF). The input/output settings of P6IO will be ignored for pins

that have been set to the secondary function by P6SF.

INT0 (P5_0), INT1 (P6_1):

These pins input external interrupts 0 and 1.

RXD1 (P6_2):

This pin inputs receive data to the Serial Port 1 receive circuit.

TXD1 (P6_3):

This pin outputs transmit data to the Serial Port 1 transmit circuit.

RXC1 (P6_4):

This pin outputs the shift clock when the Serial Port 1 receive circuit is in master mode.

It inputs the shift clock when the receive circuit is in slave mode.

TXC1 (P6_4):

This pin outputs the shift clock when the Serial Port 1 transmit circuit is in master mode.

It inputs the shift clock when the transmit circuit is in slave mode.

After reset (by RES signal input, BRK instruction execution, or op code trap), P6 will be

high-impedance inputs.

I/O

P7_0/WR

P7_1/RD

P7_2/WAIT

P7_3/CLKOUT

P7_4/PWM0

P7_5-P7_7

Port 7 is 8 input/output pins. Input or output can be specified for each bit with the

Port 7 Mode Register (P7IO).

P7_0-P7_4 also have a secondary function as input/output pins for internal operation.

Their secondary function can be set for each bit with the Port 7 Secondary Function

Control Register (P7SF). The input/output settings of P7IO will be ignored for pins

that have been set to the secondary function by P7SF.

WR (P7_0):

This pin outputs the strobe signal for write operations when external data memory

is accessed.

RD (P7_1):

This pin outputs the strobe signal for read operations when external data memory

is accessed.

WAIT (P7_2):

This pin inputs a wait to the internal CPU when external data memory with a slow

access time is accessed. CPU is driven to "WAIT" state during WAIT pin high.

CLKOUT (P7_3):

This pin outputs the clock pulses set by the Peripheral Control Register (PRPHF).

PWM0 (P7_4):

This pin outputs PWM0.

After reset (by RES signal input, BRK instruction execution, or op code trap), P7 will

be high-impedance inputs.

When P7_0 and P7_1 are used as their secondary functions (WR, RD), they need to

be connected externally to pull-up resistors.

I/O

P8_0-P8_7

I/O

Port 8 is 8 input/output pins. Input or output can be specified for each bit with the

Port 8 Mode Register (P8IO).

After reset (by RES signal input, BRK instruction execution, or op code trap), P8 will

be high-impedance inputs.