MC68331TS datasheet(36/84 Pages) FREESCALE

36 / 84 page

MC68331TS/D

The write to the port F data register is stored in the internal data latch, and if any port F pin is configured

as an output, the value stored for that bit is driven onto the pin. A read of the port F data register returns

the value at the pin only if the pin is configured as a discrete input. Otherwise, the value read is the value

stored in the register.

The port F data register is a single register that can be accessed in two locations. When accessed at

$YFFA19, the register is referred to as PORTF0; when accessed at $YFFA1B, the register is referred

to as PORTF1. The register can be read or written at any time. It is unaffected by reset.

The bits in this register control the direction of the pin drivers when the pins are configured for I/O. Any

bit in this register set to one configures the corresponding pin as an output. Any bit in this register

cleared to zero configures the corresponding pin as an input.

The bits in this register control the function of each port F pin. Any bit cleared to zero defines the corre-

sponding pin to be an I/O pin. Any bit set to one defines the corresponding pin to be an interrupt request

signal or MODCLK. The MODCLK signal has no function after reset.

Data bus pin 9 controls the state of this register following reset. If DATA9 is set to one during reset, the

zero during reset, this register is set to $00, defining all port F pins as I/O pins.

PORTF0, PORTF1 — Port F Data Register

$YFFA19, $YFFA1B

NOT USED

PF7

PF6

PF5

PF4

PF3

PF2

PF1

PF0

RESET:

DDRF — Port F Data Direction Register

$YFFA1D

NOT USED

DDF7

DDF6

DDF5

DDF4

DDF3

DDF2

DDF1

DDF0

RESET:

PFPAR — Port F Pin Assignment Register

$YFFA1F

NOT USED

PFPA7

PFPA6

PFPA5

PFPA4

PFPA3

PFPA2

PFPA1

PFPA0

RESET:

DATA9

Table 17 Port F Pin Assignments

PFPAR Field

Port F Signal

Alternate Signal

PFPA7

PF7

IRQ7

PFPA6

PF6

IRQ6

PFPA5

PF5

IRQ5

PFPA4

PF4

IRQ4

PFPA3

PF3

IRQ3

PFPA2

PF2

IRQ2

PFPA1

PF1

IRQ1

PFPA0

PF0

MODCLK

Freescale Semiconductor, Inc.

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