T410 datasheet(42/84 Pages) STMICROELECTRONICS

42 / 84 page

ST52T410/ST52T420/E420

42/84

Figure 7.2 Port B Functional Blocks

7.3 Output Mode

The output configuration is selected by setting the

corresponding configuration register bit to “0”

(REG_CONF 4, 13 and 15) (see paragraph I/O

Port Configuration Registers).

Digital data is transferred to the related I/O Port by

means of the Output register via the assembler

instructions LDPE or LDPR.

7.4 Alternate Functions

Several

ST52T410/ST52x420

pins

are

configurable to be used with different functions

(see Table 1.1).

When an on-chip peripheral is configured to use a

pin, the correct I/O mode of the related pin must be

selected.

For example: if pin 20 (PA5/T0CLK) has to be used

as an external PWM/Timer0 clock, the Reg_Conf

4(5) bit must be set to ‘1’.

When the signal is an on-chip peripheral input the

related I/O pin has to be configured in Input Mode.

When a pin is used as an A/D Converter input the

related I/O pin is automatically set in tristate. The

analog

multiplexer

(controlled

the

A/D

configuration

switches

the

analog

voltage present on the selected pin to the common

analog rail, which is connected to the ADC input

(ST52x420 only).

It is recommended that the voltage level not be

changed or that any port pins not be loaded while

conversion

running.

Furthermore,

recommended that clocking pins not be located

close to a selected analog pin (ST52x420 only).

Table 7.2

Input Register and I/O Ports

PORT A

PORT B

PORT C

IR 9

IR 10

IR 11

Table 7.3 Output Register and I/O Ports

PORT A

PORT B

PORT C

OR 0

OR 1

OR 2

TO A/D CONVERTER

CMOS

PORT B PIN

FROM CONFIGURATION REGISTER

TO INPUT REGISTER

FROM OUTPUT REGISTERS

FROM CONFIGURATION REGISTER

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