ZPSD301 datasheet(12/85 Pages) STMICROELECTRONICS

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PSD3XX Family

Table 2.

PSD3XX Pin

Descriptions

(cont.)

Name

Type

Description

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

PB0

can have the following functions: (see Figure 6)

PB1

1. MCU I/O —in this mode, the direction of the pin is defined by its

PB2

direction bit, which resides in the direction register.

PB3

2. Chip select output —each of PB0-3 has four product terms

PB4

I/O

available per pin, while PB4-7 have 2 product terms each.

PB5

See Figure 4.

PB6

3. CMOS or open-drain.

PB7

4. If your MCU is non-multiplexed, and the data bus width is

16 bits: data bus input—connect your data bus (D8-D15) to these

pins. See Figure 3.

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 bit(s) can be 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/A0

If your MCU is multiplexed:

AD1/A1

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

AD2/A2

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

AD3/A3

I/O

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

AD4/A4

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

AD5/A5

(RD, WR, etc.).

AD6/A6

If your MCU is non-multiplexed:

AD7/A7

These pins are the low-order address inputs (A0-A7)

AD8/A8

If your MCU is multiplexed with a 16-bit data bus:

AD9/A9

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

AD10/A10

(AD8-AD15). As inputs, address information is latched by the

AD11/A11

I/O

ALE/AS signal and used internally the PSD. The pins also

AD12/A12

serve as MCU data bus inputs or outputs, depending on the MCU

AD13/A13

control signals (RD, WR, etc.).

AD14/A14

If your MCU is non-multiplexed or has a 8-bit data bus:

AD15/A15

These pins are the high-order address inputs (A8-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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