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Programming Model
10.4.7.3
Port F Dedicated I/O Functions
The eight PFDATA lines are multiplexed with the dedicated I/O signals whose assignments are shown in
Table 10-33.
Table 10-33. Port F Dedicated I/O Function Assignments
Bit
0
1
2
3
4
5
6
7
The LCONTRAST function controls the pulse-width modulator (PWM) inside the LCD controller to
adjust the supply voltage to the LCD panel. Bit 1 can be programmed as IRQ5, an external level 5
interrupt.
The CLKO output clock signal is internally connected to the SYSCLK clock output of the internal CGM.
This signal is provided for external reference. The output can be disabled to reduce power consumption
and electromagnetic emission. This signal defaults to a PF2 input signal. See Section 4.2, "CGM
Operational Overview," on page 4-3 for more information about this signal.
Bit 7 is used for the chip-select signal CSA1. See Section 6.2, "Chip-Select Operation," on page 6-2 for
detailed information.
10-26
GPIO Function
Data bit 0
Data bit 1
Data bit 2
Data bit 3
Data bit 4
Data bit 5
Data bit 6
Data bit 7
MC68VZ328 User's Manual
Dedicated I/O Function
LCONTRAST
IRQ5
CLKO
A20
A21
A22
A23
CSA1
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