s908ab32ag0cfue Freescale Semiconductor, Inc, s908ab32ag0cfue Datasheet - Page 322

• Manufacturer Part Number: s908ab32ag0cfue
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
Technical Data
322
When DDRCx is a logic 1, reading address $0002 reads the PTCx data
latch. When 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 17-4
Notes:
1. X = don’t care; except PTC2.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
DDRC
Bit
0
1
0
1
READ DDRC ($0006)
WRITE DDRC ($0006)
WRITE PTC ($0002)
READ PTC ($0002)
PTC Bit
X
summarizes the operation of the port C pins.
X
2
2
(1)
Input/Output (I/O) Ports
Table 17-4. Port C Pin Functions
Input, Hi-Z
I/O Pin Mode
Figure 17-10. Port C I/O Circuit
Input, Hi-Z
RESET
Output
Output
(2)
Accesses to DDRC
DDRCx
PTCx
DDRC[5:0]
DDRC[5:0]
Read/Write
DDRC7
DDRC7
MCLK
MC68HC908AB32
Freescale Semiconductor
PTC[5:0]
Read
Pin
Pin
Accesses to PTC
0
MCLKEN
PTC[5:0]
PTC[5:0]
—
PTC2 ONLY
PTC2
Write
—
Rev. 1.1
PTCx
(3)