XC68HC705JB3 Motorola, XC68HC705JB3 Datasheet - Page 51

• Manufacturer Part Number: XC68HC705JB3
• Description: MICROCONTROLLER
• Manufacturer: Motorola

7.3
7.3.1 Port-C Data Register
7.3.2 Port-C Data Direction Register
MC68HC05JB3
REV 1
PORT-C
Port-C is a 4-bit bi-directional port. The Port-C data register is at $0002 and the
data direction register (DDRC) is at $0006. Reset does not affect the data regis-
ters, but clears the data direction registers, thereby returning the port pins to
inputs. Writing a ‘one’ to a DDR bit sets the corresponding port bit to output mode.
All Port-C pins have programmable pull-down resistors, and are only available on
the 28-pin version of the device.
PC0 is also used as the 16-timer OCMP output pin.
The table below summarizes the pin configurations for Port-A.
PORTC
$0002
DDRC
$0006
reset:
reset:
PDRCx
W
W
R
R
0
0
1
1
OCMPO
Output Driver
BIT 7
BIT 7
0
0
Figure 7-1. PB1 Slow Falling-edge Output
50pF
VROFF
BIT 6
BIT 6
5.0V
2.2V
0
0
0V
DDRCx
INPUT/OUTPUT PORTS
0
1
0
1
November 5, 1998
BIT 5
BIT 5
0
0
165ns
BIT 4
BIT 4
0
0
Pin Configuration
Input with pull-down
DDRC3
Output Push-Pull
Output Push-Pull
GENERAL RELEASE SPECIFICATION
BIT 3
BIT 3
PC3
0
0
Input
330ns
DDRC2
BIT 2
BIT 2
PC2
0
0
DDRC1
BIT 1
BIT 1
PC1
0
0
MOTOROLA
DDRC0
BIT 0
BIT 0
PC0
0
0
7-5