PSD913F2 datasheet(48/94 Pages) STMICROELECTRONICS

48 / 94 page

PSD9XX Family

Preliminary Information

The

PSD9XX

Functional

Blocks

(cont.)

9.4.2 Port Operating Modes

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

PSDsoft, 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, and Address Input, are the only modes that must

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

microcontroller at run-time.

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 Outputs

Yes

PLD Inputs

Yes

Address Out

Yes (A7 – 0)

or A15 – 8)

Address In

Yes

Data Port

Yes (D7 – 0)

JTAG ISP

Yes

Table 20. Port Operating Modes

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