s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 249

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Figure 23-10
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
shows the port C I/O logic.
X = don’t care
Hi-Z = high impedance
1. Writing affects data register, but does not affect input.
Avoid glitches on port C pins by writing to the port C data register before
changing data direction register C bits from 0 to 1.
Value
Bit
0
1
0
1
READ DDRC ($0006)
WRITE DDRC ($0006)
WRITE PTC ($0002)
READ PTC ($0002)
PTC
Bit
X
X
2
2
Table 23-3. Port C Pin Functions
RESET
Figure 23-10. Port C I/O Circuit
MC68HC908AZ32A Data Sheet, Rev. 2
Input, Hi-Z
Input, Hi-Z
I/O Pin
Output
Output
Mode
Table 23-3
NOTE
DDRCx
PTCx
Accesses to
Read/Write
DDRC[5:0]
DDRC[5:0]
DDRC[2]
DDRC[2]
DDRC
summarizes the operation of the port C pins.
PTC[5:0]
Read
Pin
Pin
Accesses to PTC
0
PTC[5:0]
PTC[5:0]
PTC2
Write
—
PTCx
(1)
Port C
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