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12.9 Port Options
12.9.1 Port Option Control Register (POC)
Advance Information
204
When bit DDRFx is a logic one, reading address $0009 reads the PTFx
data latch. When bit DDRFx is a logic zero, reading address $0009 reads
the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
the operation of the port F pins.
Table 12-7. Port F Pin Functions
DDRE
PTE
I/O Pin Mode
Bit
Bit
(1)
0
X
Input, Hi-Z
1
X
Output
1. X = don't care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
All pins of port A, port B and port C have programmable pullup resistors.
Port C also has LED drive capability.
The pullup option for each port is controlled by one bit in the port option
control register. One bit controls the LED drive configuration on port C.
Address:
$001D
Bit 7
6
Read:
0
0
Write:
Reset:
0
0
= Unimplemented
Figure 12-22. Port Option Control Register (POC)
Table 12-7
Accesses to
DDRE
Read/Write
(2)
DDRF[7:0]
DDRF[7:0]
5
4
3
0
0
LDD
1
0
0
MC68HC(7)08KH12
summarizes
Accesses to PTE
Read
Write
(3)
Pin
PTF[7:0]
PTF[7:0]
PTF[7:0]
2
1
Bit 0
PCP
PBP
PAP
0
0
0
Rev. 1.1
—
Freescale Semiconductor
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