MC68HC08AZ60 Datasheet, PDF (288/452 Pages) Motorola, Inc – Advance Information

I/O Ports
Freescale Semiconductor, Inc.
READ DDRC ($0006)
WRITE DDRC ($0006)
RESET
WRITE PTC ($0002)
DDRCx
PTCx
PTCx
READ PTC ($0002)
Figure 10. Port C I/O Circuit
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. Table 3 summarizes the
operation of the port C pins.
Table 3. Port C Pin Functions
Bit
Value
PTC
Bit
I/O Pin
Mode
Accesses
to DDRC
Read/Write
Accesses to PTC
Read
Write
0
2
Input, Hi-Z DDRC[2]
Pin
PTC2
1
2
Output
DDRC[2]
0
—
0
X
Input, Hi-Z DDRC[5:0]
Pin
PTC[5:0]⁽¹⁾
1
X
Output
DDRC[5:0] PTC[5:0]
PTC[5:0]
X = don’t care
Hi-Z = high impedance
1. Writing affects data register, but does not affect input.
MC68HC08AZ60 — Rev 1.0
288
I/O Ports
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10-ioports
MOTOROLA