mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 241

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

17.5.3 Port C Options
MC68HC908BD48
Freescale Semiconductor
PTCPUE Bit
Notes:
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
X
0
DDRC Bit
—
Rev. 2.1
0
1
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.
The ADCH4–ADCH0 bits in the
(ADSCR) defines which PTCx/ADCx pin is used as an ADC input and
overrides any control from the port I/O logic by forcing that pin as the
input to the analog circuitry. See
Register.
PTC Bit
X
X
Table 17-5. Port C Pin Functions
READ DDRC ($0006)
WRITE DDRC ($0006)
WRITE PTC ($0002)
READ PTC ($0002)
I/O Pin Mode
Input, Hi-Z
Input/Output (I/O) Ports
Output
Figure 17-11. Port C I/O Circuit
RESET
(2)
Accesses to DDRC
DDRC5–DDRC0
DDRC5–DDRC0
Read/Write
ADC Status and Control Register
DDRCx
12.8.1 ADC Status and Control
PTCx
PTC5–PTC0
Table 17-5
Read
Pin
Accesses to PTC
Input/Output (I/O) Ports
PTC5–PTC0
summarizes
PTC5–PTC0
Write
Data Sheet
PTCx
241
(3)