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68HC705JB3 Datasheet(PDF) 48 Page - Freescale Semiconductor, Inc

Part # 68HC705JB3
Description  8-bit microcontroller units (MCUs)
PDF  134 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705JB3 Datasheet(HTML) 48 Page - Freescale Semiconductor, Inc

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GENERAL RELEASE SPECIFICATION
November 5, 1998
MOTOROLA
INPUT/OUTPUT PORTS
MC68HC05JB3
7-2
REV 1
7.1.1 Port-A Data Register
7.1.2 Port-A Data Direction Register
DDRAx — PAx Data Direction
1 =
Port pin set as output.
0 =
Port pin set as input.
7.1.3 Port-A Pull-down/up Register
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
1 =
Internal pull-down disabled.
0 =
Internal pull-down enabled.
7.1.4 PA0-PA3 Interrupts
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.
PDRAx
DDRAx
Pin Configuration
0
0
Input with pull-down
0
1
Output Push/Pull
1
0
Input
1
1
Output Push/Pull
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
PORTA
R
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
$0000
W
reset:
00000000
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
DDRA
R
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
$0004
W
reset:
00000000
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
PDURA
R
$0010
W
PDRA7
PDRA7
PDRA7
PDRA7
PDRA7
PDRA7
PDRA7
PDRA7
reset:
00000000
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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