PSD413A2 datasheet(53/123 Pages) STMICROELECTRONICS

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PSD4XX Family

Port Mode

Port A

Port B

Port C

Port D

Port E

Standard MCU I/O

Yes

PLD I/O

Yes

Input Only

* Input Only*

Yes

Address Out

Yes

Address In

Yes

Data Port

Yes

Alternate Function In

Yes

Peripheral I/O

Yes

Open Drain

Yes

* PSD4XXA2 and ZPSD4XXA2 Only.

** For external decoding. Cannot be latched by ALE

9.3.7 Peripheral I/O

This mode enables the microcontroller to read or write to a peripheral though Port A. When

there is no read/write operation, Port A is tri-stated. One of the applications of Peripheral

I/O is in a DMA based design.

t Configuration

1. Declare the pins used as pheripheral I/O in the ABEL file.

2. Write logic equations for PSEL0 and PSEL1.

3. Write a “1” to the PIO bit in the VM Register to activate the Peripheral I/O operation.

See the section on Peripheral I/O for a detailed description.

9.3.8 Open Drain Outputs

This mode enables the user to configure Ports C and D pins as open drain outputs. CMOS

output is the default configuration. Writing “1” to the corresponding bit in the Open Drain

Table 12. Operating Modes of the I/O Ports

Table 12 summarizes the operating modes of the I/O ports. Not all the functions are

available to every port.

The PSD4XX

Architecture

(cont.)

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