PSD813F1 datasheet(58/120 Pages) STMICROELECTRONICS

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PSD813F1-A

Preliminary

The

PSD813F1

Functional

Blocks

(cont.)

9.4.2 Port Operating Modes

The I/O Ports have several modes of operation. Some modes can be defined using

PSDabel, some by the microcontroller writing to the Control Registers in CSIOP space, and

some by both. The modes that can only be defined using PSDsoft must be programmed

into the device and cannot be changed unless the device is reprogrammed. The modes

that can be changed by the microcontroller can be done so dynamically at run-time. The

PLD I/O, Data Port, Address Input, and Peripheral I/O modes are the only modes that

must be defined before programming the device. All other modes can be changed by the

microcontroller at run-time. See Application Note 55 for more detail.

Table 20 summarizes which modes are available on each port. Table 23 shows how and

where the different modes are configured. Each of the port operating modes are described

in the following subsections.

Port Mode

Port A

Port B

Port C

Port D

MCU I/O

Yes

PLD I/O

McellAB Outputs

Yes

McellBC Outputs

Yes

Additional Ext. CS Outputs

Yes

PLD Inputs

Yes

Address Out

Yes (A7 – 0)

or A15 – 8)

Address In

Yes

Data Port

Yes (D7 – 0)

Peripheral I/O

Yes

JTAG ISP

Yes

Table 20. Port Operating Modes

*Can be multiplexed with other I/O functions.

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