UPSD325X datasheet(46/176 Pages) STMICROELECTRONICS

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µPSD325X DEVICES

46/176

I/O PORTS (MCU MODULE)

The MCU Module has five ports: Port0, Port1,

Port2, Port3 and Port 4. (Refer to the PSD Module

section on I/O ports A,B,C and D). Ports P0 and

P2 are dedicated for the external address and data

bus and is not available in the 80 pin package de-

vices.

Port1 - Port3 are the same as in the standard 8032

micro-controllers, with the exception of the addi-

tional special peripheral functions. All ports are bi-

directional. Pins of which the alternative function is

not used may be used as normal bi-directional I/O.

The use of Port1- Port4 pins as alternative func-

tions

are

carried

out

automatically

the

µPSD325X devices provided the associated SFR

Bit is set HIGH.

The following SFR registers (Tables 29, 30, and

31) are used to control the mapping of alternate

functions onto the I/O port bits. Port 1 alternate

functions are controlled using the P1SFS register,

except for Timer 2 and the 2nd UART which are

enabled by their configuration registers. P1.0 to

P1.3 are default to GPIO after reset.

Port 3 pins 6 and 7 have been modified from the

standard 8032. These pins that were used for

READ and WRITE control signals are now GPIO

or I2C bus pins. The READ and WRITE pins are

assigned to dedicated pins.

Port 3 and Port 4 alternate functions are controlled

using the P3SFS and P4SFS Special Function Se-

lection registers. After a reset, the I/O pins default

to GPIO. The alternate function is enabled if the

corresponding bit in the PXSFS register is set to

'1.'

Table 28. I/O Port Functions

Table 29. P1SFS (91H)

Table 30. P3SFS (93H)

Table 31. P4SFS (94H)

Port Name

Main Function

Alternate

Port 1

GPIO

Timer 2 - Bits 0,1

2nd UART - Bits 2,3

ADC - Bits 4..7

Port 3

GPIO

UART - Bits 0,1

Interrupt - Bits 2,3

Timers - Bits 4,5

I2C - Bits 6,7

Port 4

GPIO

DDC - Bits 0..2

PWM - Bits 3..7

USB +/-

USB +/- Only

76543210

0=Port 1.7

1=ACH3

0=Port 1.6

1=ACH2

0=Port 1.5

1=ACH1

0=Port 1.4

1=ACH0

Bits Reserved

76543210

0 = Port 1.7

1 = SCL

from I2C unit

0 = Port 1.6

1 = SDA

from I2C unit

Bits are reserved.

76543210

0=Port 4.7

1=PWM 4

0=Port 4.6

1=PWM 3

0=Port 4.5

1=PWM 2

0=Port 4.4

1=PWM 1

0=Port 4.3

1=PWM 0

0=Port 4.2

1=VSYNC

0=Port 4.1

1=DDC -

SCL

0=Port 4.0

1=DDC -

SDA

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