PSD813F2 datasheet(55/110 Pages) STMICROELECTRONICS

55 / 110 page

PSD8XX Family

PSD835G2

The

PSD835G2

Functional

Blocks

(cont.)

9.4.2 Port Operating Modes

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

PSDsoft, some by the microcontroller writing to the 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, Peripheral I/O and MCU Reset 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.

Table 16 summarizes which modes are available on each port. Table 17 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

Port E

Port F

Port G

MCU I/O

Yes

PLD I/O

McellA Outputs

Yes

McellB Outputs

Yes

Additional Ext. CS Outputs

Yes

PLD Inputs

Yes

Address Out

Yes

(A7-0)

(A15-8)

Address In

Yes

Data Port

Yes

Peripheral I/O

Yes

JTAG ISP

Yes*

Table 16. Port Operating Modes

*Can be multiplexed with other I/O functions.

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