mc68hc05p9a Freescale Semiconductor, Inc, mc68hc05p9a Datasheet - Page 75

• Manufacturer Part Number: mc68hc05p9a
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

PC0–PC1 High
Current
Sink/Source
Capability
15-mc68hc05p9a
MOTOROLA
READ DATA DIRECTION REGISTER C ($0006)
WRITE DATA DIRECTION REGISTER C ($0006)
WRITE PORT C DATA REGISTER ($0002)
READ PORT C DATA REGISTER ($0002)
Writing a logic 1 to a DDRC bit enables the output buffer for the
corresponding port C pin; a logic 0 disables the output buffer.
When bit DDRCx is a logic 1, reading address $0002 reads the PCx 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.
of the port C pins.
The outputs for the lower two bits of port C (PC0–PC1) can source/sink
relatively high current. (See
page 130 and
details.)
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 37. Port C I/O Logic
Data Direction Bit
1. Hi-Z = high impedance
2. Writing affects data register, but does not affect input.
Go to: www.freescale.com
RESET
3.3 V DC Electrical Characteristics
Parallel I/O Ports
0
1
Table 17. Port C Pin Operation
DDRCx
PCx
5.0 V DC Electrical Characteristics
I/O Pin Mode
Input, Hi-Z
Output
Table 16
(1)
Accesses to Data Bit
Read
Latch
Pin
summarizes the operation
HIGH CURRENT SOURCE/SINK
CAPABILITY (PINS PA0–PA1 ONLY)
on page 132 for
Latch
Write
PCx
Latch
Parallel I/O Ports
(2)
on
Port C
75