PSD511B1 datasheet(12/153 Pages) STMICROELECTRONICS

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PSD5XX Family

8.0

Table 2.

PSD5XX Pin

Descriptions

Pin Name

Pin Function

Type

Function Descriptions

ADIO0 – ADIO15

Address/ data bus

I/O

1. Address/data bus, multiplexed

bus mode

2. Address bus, non-multiplexed

bus mode

Multiple Names

Multiple functions

1. Read

1. Read signal

2. E

2. E signal (Clock)

3. DS

3. Data strobe signal

4. LDS

4. Low byte data strobe

Multiple Names

Multiple functions

1. WR

1. Write signal

2. R/W

2. Read-write signal

3. WRL

3. Low byte write signal

CSI

Chip Select Input

Active low, select PSD5XX.

standby mode if high.

RESET

Reset Input

Reset I/O ports, ZPLD/macrocells,

Timers and Configuration

Registers. Active low.

CLKIN

Input clock

Clock input to Timers, ZPLD

macrocells, ZPLD array, and APD

counter; connect to ground if clock

input not used.

PA0 – PA7

I/O Port A

I/O

Multiple functions

1. I/O port

2. ZPLD/macrocell I/O port

3. Latched address outputs

(PA0–PA7)

→ (A0–A7)

4. High address inputs (A16 – A23)

5. Timer outputs (PA0 – PA3)

PB0 – PB7

I/O Port B

I/O

Multiple functions

1. I/O port

2. ZPLD/macrocell I/O port

3. Latched address outputs

(PB0–PB7)

→ (A0–A7) or (A8–A15)

4. Timer outputs (PB0-PB3)

PC0 – PC7

I/O Port C

I/O

Multiple functions

CMOS

1. I/O port

2. ZPLD input port

3. Latched address outputs

(PC0 – PC7)

→ (A0–A7)

4. Data Port (D0 – D7,

non-multiplexed bus)

PD0 – PD7

I/O Port D

I/O

Multiple functions

CMOS

1. I/O port

2. ZPLD input port

3. Latched address outputs

(PD0–PD7)

→ (A0–A7) or (A8–A15)

4. Data Port (D8-D15,

non-multiplexed bus)

The following table describes the pin names and pin functions of the PSD5XX. Pins that

have multiple names and/or functions are defined by user configuration.

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