mc68hc908gp32 Freescale Semiconductor, Inc, mc68hc908gp32 Datasheet - Page 123

• Manufacturer Part Number: mc68hc908gp32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Figure 12-11
When bit DDRCx is a logic 1, reading address $0002 reads the PTCx data latch. When bit DDRCx is a
logic 0, reading address $0002 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
Freescale Semiconductor
PTCPUE Bit
Notes:
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
4. I/O pin pulled up to V
X
1
0
shows the port C I/O logic.
For those devices packaged in a 40-pin dual in-line package and 42-pin
shrink dual in-line package, PTC5 and PTC6 are connected to ground
internally. DDRC5 and DDRC6 should be set to a 0 to configure PTC5 and
PTC6 as inputs.
DDRC Bit
0
0
1
READ DDRC ($0006)
WRITE DDRC ($0006)
WRITE PTC ($0002)
READ PTC ($0002)
PTCPUEx
DD
by internal pullup device.
PTC Bit
X
X
X
(1)
RESET
Table 12-4. Port C Pin Functions
Figure 12-11. Port C I/O Circuit
MC68HC908GP32 Data Sheet, Rev. 10
I/O Pin Mode
V
Input, Hi-Z
Input, V
DD
INTERNAL
PULLUP
DEVICE
Output
DD
Table 12-4
(4)
(2)
NOTE
DDRCx
PTCx
Accesses to DDRC
DDRC6–DDRC0
DDRC6–DDRC0
DDRC6–DDRC0
summarizes the operation of the port C pins.
Read/Write
PTC6–PTC0
Read
Pin
Pin
Accesses to PTC
PTCx
PTC6–PTC0
PTC6–PTC0
PTC6–PTC0
Write
Port C
(3)
(3)
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