MC68HC08AZ60A Datasheet, PDF (325/480 Pages) Motorola, Inc – Microcontrollers

I/O Ports
Port C
Figure 20-9 shows the port C I/O logic.
READ DDRC ($0006)
WRITE DDRC ($0006)
RESET
WRITE PTC ($0002)
.
DDRCx
PTCx
PTCx
READ PTC ($0002)
Figure 20-9. Port C I/O Circuit
When bit DDRCx is a logic one, reading address $0002 reads the PTCx
data latch. When bit DDRCx is a logic zero, 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. Table 20-4 summarizes
the operation of the port C pins.
Table 20-4. Port C Pin Functions
DDRC bit
PTC Bit
I/O Pin Mode
Accesses to
DDRC
Read/Write
0
2
Input, Hi-Z
DDRC[7]
1
2
Output
DDRC[7]
0
X⁽¹⁾
Input, Hi-Z^{(2) DDRC[5:0]}
1
X
Output
DDRC[5:0]
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
Accesses to PTC
Read
Pin
0
Pin
PTC[5:0]
Write
PTC2
—
PTC[5:0]⁽³⁾
PTC[5:0]
MC68HC08AZ60A — Rev 0.0
MOTOROLA
I/O Ports
Advance Information
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