PSD501B1 datasheet(44/153 Pages) STMICROELECTRONICS

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PSD5XX Family

9.3.7 Alternate Function In

This mode is per-pin configurable and enables the user to define the pins in Port E to

perform Alternate function. Alternate Function includes inputs to Counter/Timers and APD

clock.

t Configuration

1. Select input functions in PSD configuration

2. PSD compiler assigns pins for the selected function.

9.3.8 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 Peripheral 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.

9.3.9 Open Drain Outputs

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

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

Port Mode

Port A

Port B

Port C

Port D

Port E

Standard MCU I/O

Yes

PLD I/O

Yes

Input Only

Yes

Address Out

Yes

Address In

Yes

Data Port

Yes

Special Function Out

Yes

Alternate Function In

Yes

Peripheral I/O

Yes

Open Drain

Yes

*For external decoding. Cannot be latched by ALE.

Table 11. Operating Modes of the I/O Ports

The following table summarizes the operating modes of the I/O ports. Not all functions are

available to every port.

I/O Ports

(Cont.)

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