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accept the data, but the data written to each cannot be accessed until the corresponding pin is configured as
an output. The actual value on the pin is reported when these bits are read, regardless of whether they are
configured as input or output.
10.4.3.3
Port C Dedicated I/O Functions
The eight PCDATA lines are multiplexed with the LCD controller dedicated I/O signals whose
assignments are shown in Table 10-14.
Table 10-14. Port C Dedicated Function Assignments
Bit
0
1
2
3
4
5
6
7
10.4.3.4
Port C Pull-down Enable Register
The Port C pull-down enable register (PCPDEN) controls the pull-down resistors for each line in Port C.
The settings for the bit positions are shown in Table 10-15.
PCPDEN
BIT 7
PD7
TYPE
RESET
Table 10-15. Port C Pull-down Enable Register Description
Name
PDx
Pull-down—These bits enable the pull-down resistors on the
Bits 7–0
port.
GPIO Function
Port C Pull-down Enable Register
6
5
PD6
PD5
rw
rw
rw
1
1
1
Description
I/O Ports
Dedicated I/O 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
4
3
PD4
PD3
rw
rw
1
1
0xFF
0 = Pull-down resistors are disabled
1 = Pull-down resistors are enabled
Programming Model
LD0
LD1
LD2
LD3
LFLM
LLP
LCLK
LACD
0x(FF)FFF412
2
1
BIT 0
PD2
PD1
PD0
rw
rw
rw
1
1
1
Setting
10-13
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