MC68HC708AS48

Manufacturer Part NumberMC68HC708AS48
DescriptionAdvance Information
ManufacturerFREESCALE [Freescale Semiconductor, Inc]
MC68HC708AS48 datasheet
 


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Page 196/396

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Input/Output (I/O) Ports
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.
the operation of the port C pins.
DDRC
Bit
[7] = 0
[7] = 1
0
1
X = don’t care
Hi-Z = high impedance
1. Writing affects data register, but does not affect input.
Advance Information
196
READ DDRC ($0006)
WRITE DDRC ($0006)
DDRCx
RESET
WRITE PTC ($0002)
PTCx
READ PTC ($0002)
Figure 15-10. Port C I/O Circuit
Table 15-3. Port C Pin Functions
Accesses
PTC
I/O Pin
to DDRC
Bit
Mode
Read/Write
Input, Hi-Z
DDRC[7]
PTC2
PTC2
Output, MCLK
DDRC[7]
X
Input, Hi-Z
DDRC[5:0]
X
Output
DDRC[5:0]
Input/Output (I/O) Ports
PTCx
Table 15-3
summarizes
Accesses to PTC
Read
Write
0
PTC2
Data Latch
(1)
Pin
PTC[5:3, 1:0]
PTC[5:0]
PTC[5:3, 1:0]
MC68HC708AS48
Rev. 4.0
MOTOROLA