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PSD303R

Low Cost Field Programmable Microcontroller Peripherals

STMicroelectronics 

PSD3XX Family

Table 2.

PSD3XX Pin

Descriptions

(cont.)

Name

PB0

PB1

PB2

PB3

PB4

PB5

PB6

PB7

Type

Description

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

can have the following functions: (see Figure 6)

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

direction bit, which resides in the direction register.

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

I/O

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

See Figure 4.

3. CMOS or open-drain.

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.

t(s) PC0

c PC1

du PC2

lete Pro uct(s) AD0/A0

d AD1/A1

so ro AD2/A2

b P AD3/A3

- O te AD4/A4

) le AD5/A5

AD6/A6

t(s so AD7/A7

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

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

I/O

design file. When declared as an address, the bit(s) can be latched

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.

If your MCU is multiplexed:

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

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

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

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

(RD, WR, etc.).

If your MCU is non-multiplexed:

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

uc Ob AD8/A8

d - AD9/A9

ro ) AD10/A10

P t(s AD11/A11 I/O

AD12/A12

lete uc AD13/A13

d AD14/A14

so roAD15/A15

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

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

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

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

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

control signals (RD, WR, etc.).

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

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

b P GND

P Ground Pin

O lete VCC

P Supply voltage input.

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

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