PSD913F2 datasheet(17/94 Pages) STMICROELECTRONICS

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Preliminary Information

PSD9XX Family

Table 5.

PSD9XX

Descriptions

(cont.)

Pin Name

Pin*

Type

Description

(PLCC)

PC7

I/O

PC7 pin of Port C. This port pin can be configured to have

the following functions:

1. MCU I/O — write to or read from a standard output or

input port.

2. Input to the PLDs.

3. DBE — active-low Data Byte Enable input from 68HC912

type MCUs.

This pin can be configured as a CMOS or Open Drain output.

PD0

I/O

PD0 pin of Port D. This port pin can be configured to have

the following functions:

1. ALE/AS input latches address output from the MCU.

2. MCU I/O — write or read from a standard output or input

port.

3. Input to the PLDs.

4. General Purpose PLD output.

PD1

I/O

PD1 pin of Port D. This port pin can be configured to have

the following functions:

1. MCU I/O — write to or read from a standard output or

input port.

2. Input to the PLDs.

3. General Purpose PLD output

4. CLKIN — clock input to the automatic power-down

unit’s power-down counter, and the PLD AND array.

PD2

I/O

PD2 pin of Port D. This port pin can be configured to have

the following functions:

1. MCU I/O — write to or read from a standard output or

input port.

2. Input to the PLDs.

3. General Purpose PLD output.

4. CSI — chip select input. When low, the MCU can access

the PSD memory and I/O. When high, the PSD memory

blocks are disabled to conserve power.

VCC

15, 38

Power pins

GND

1,16,26

Ground pins

Port A

Port B

Microcontroller

Port A (3:0) Port A (7:4)

Port B (3:0)

Port B (7:4)

8051XA (8-bit)

N/A

Address [7:4]

Address [11:8] N/A

80C251 (page mode)

N/A

Address [11:8] Address [15:12]

All other 8-bit

multiplexed

Address [3:0]

Address [7:4]

Address [3:0]

Address [7:4]

8-bit non-multiplexed

bus

N/A

Address [3:0]

Address [7:4]

Table 6. I/O Port Latched Address Output Assignments*

N/A = Not Applicable

**Refer to the I/O Port Section on how to enable the Latched Address Output function.

*The pin numbers in this table are for the PLCC package only. See the package information section for pin

numbers on other package types.

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