PSD833F2 datasheet(68/128 Pages) STMICROELECTRONICS

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I/O ports

PSD8XXFX

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Doc ID 7833 Rev 7

16.2

Port operating modes

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

PSDabel, some by the MCU writing to the Control registers in CSIOP space, and some by

both. The modes that can only be defined using PSDsoft Express must be programmed into

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

be changed by the MCU 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 MCU at run-time. See

Application Note AN1171 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 sections.

Figure 25.

General I/O port architecture

DATA OUT

REG.

ADDRESS

MACROCELL OUTPUTS

ENABLE PRODUCT TERM (.OE)

EXT CS

ALE

READ MUX

CPLD - INPUT

CONTROL REG.

DIR REG.

INPUT

MACROCELL

ENABLE OUT

DATA IN

OUTPUT

SELECT

OUTPUT

MUX

PORT PIN

DATA OUT

ADDRESS

AI02885

Obsolete

Product(s)

- Obsolete

Product(s)

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