XC68HC705JB3 Motorola, XC68HC705JB3 Datasheet - Page 48

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

GENERAL RELEASE SPECIFICATION
7.1.1 Port-A Data Register
7.1.2 Port-A Data Direction Register
7.1.3 Port-A Pull-down/up Register
7.1.4 PA0-PA3 Interrupts
MOTOROLA
7-2
DDRAx — PAx Data Direction
With the pull-up/down mask option selected, each pin in Port-A has an internal
pull-down resistor which can be enabled by writing a ‘0’ to the corresponding bit in
the Port-A pull-down/up control register (PDURA) at location $0010.
PDRAx — PAx Pin Pull-down enable
A mask option selects the capability for PA0-PA3 to be used as external IRQ inter-
rupt inputs. These four I/O pins also have schmitt trigger input circuits.
See INTERRUPTS section for detail.
PORTA
$0000
DDRA
$0004
PDURA
$0010
reset:
reset:
reset:
1 = Port pin set as output.
0 = Port pin set as input.
1 = Internal pull-down disabled.
0 = Internal pull-down enabled.
PDRAx
W
W
W
R
R
R
0
0
1
1
DDRA7
PDRA7
BIT 7
BIT 7
BIT 7
PA7
0
0
0
DDRA6
PDRA7
BIT 6
BIT 6
BIT 6
PA6
0
0
0
DDRAx
INPUT/OUTPUT PORTS
0
1
0
1
November 5, 1998
DDRA5
PDRA7
BIT 5
BIT 5
BIT 5
PA5
0
0
0
DDRA4
PDRA7
BIT 4
BIT 4
BIT 4
PA4
0
0
0
Pin Configuration
Input with pull-down
DDRA3
PDRA7
Output Push/Pull
Output Push/Pull
BIT 3
BIT 3
BIT 3
PA3
0
0
0
Input
DDRA2
PDRA7
BIT 2
BIT 2
BIT 2
PA2
0
0
0
DDRA1
PDRA7
BIT 1
BIT 1
BIT 1
PA1
0
0
0
MC68HC05JB3
DDRA0
PDRA7
BIT 0
BIT 0
BIT 0
PA0
REV 1
0
0
0