PSD834F4A-20UI データシートの表示（PDF） - STMicroelectronics

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PSD834F4A-20UI

Flash in-system programmable (ISP) ipherals for 8-bit MCUs, 5 V

STMicroelectronics 

I/O ports

PSD8XXFX

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.

t(s) Figure 25. General I/O port architecture

uc DATA OUT

d REG.

ro D Q

WR

P ADDRESS

te ALE

DQ

G

le MACROCELL OUTPUTS

so EXT CS

b READ MUX

O P

) - D

DATA IN

t(s B

uc CONTROL REG.

dD Q

ro WR

P DIR REG.

te D Q

WR

ObsoleENABLE PRODUCT TERM (.OE)

DATA OUT

ADDRESS

OUTPUT

MUX

OUTPUT

SELECT

ENABLE OUT

INPUT

MACROCELL

PORT PIN

CPLD - INPUT

AI02885

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Doc ID 7833 Rev 7

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