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UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV

I/O PORTS (MCU MODULE)

The MCU Module has five ports: Port 0, Port 1,

Port 2, Port 3, and Port 4. (Refer to the PSD Mod-

ule 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 52-pin package

devices.

Port 1 - Port 3 are the same as in the standard

8032 micro-controllers, with the exception of the

additional special peripheral functions. All ports

are bi-directional. Pins of which the alternative

function is not used may be used as normal bi-di-

rectional I/O.

The use of Port 1 -Port 4 pins as alternative func-

tions

are

carried

out

automatically

the

uPSD325X 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 (I2C) and Port 4 alternate functions are con-

trolled using the P3SFS and P4SFS Special Func-

tion Selection 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.' Other Port 3 alternative functions (UART,

Interrupt, and Timer/Counter) are enabled by their

configuration register and do not require setting of

the bits in P3SFS.

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

543210

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

543210

0 = Port 3.7

1 = SCL

from I2C unit

0 = Port 3.6

1 = SDA

from I2C unit

Bits are reserved.

543210

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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