PSD211RM datasheet(11/51 Pages) STMICROELECTRONICS

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Table 1.

PSD211R Pin

Descriptions

(cont.)

PSD211R Family

Name

Type

Description

These pins make up Port C. These port pins are configurable, and

can have the following functions (see Figure 7):

1. PAD input—when configured as an input, a bit individually

PC0

becomes an address or a logic input, depending on your PSDsoft

PC1

I/O

design file. When declared as an address, the bits are latched

PC2

with ALE/AS.

2. PAD output—when configured as an output (i.e. there is an

equation written for it in your PSDsoft design file), there is one

product term available to it.

AD0

AD1

AD2

These pins are the multiplexed, low-order address/data byte

AD3

I/O

(AD0-AD7). As inputs, address information is latched by the ALE/AS

AD4

signal and used internally by the PSD. The pins also serve as MCU

AD5

data bus inputs or outputs, depending on the MCU control signals

AD6

(RD, WR, etc.).

AD7

A10

A11

I/O

These pins are the high-order address inputs (A8-A15).

A12

A13

A14

A15

GND

Ground Pin

VCC

Supply voltage input.

Legend: The Type column abbreviations are: I = input only; I/O = input/output; P = power.

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