MC68HC705J1A Input/output Register Summary - Motorola

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MC68HC705J1A

Manufacturer Part Number
MC68HC705J1A
Description
Manufacturer
Motorola
Datasheet

Specifications of MC68HC705J1A

Case
DIP-20L
2.4 Input/Output Register Summary
Addr.
Register Name
Read:
Port A Data Register
$0000
(PORTA)
Write:
See page 89.
Reset:
Read:
Port B Data Register
$0001
(PORTB)
Write:
See page 92.
Reset:
$0002
Unimplemented
$0003
Unimplemented
Read:
Data Direction Register A
$0004
(DDRA)
Write:
See page 90.
Reset:
Read:
Data Direction Register B
$0005
(DDRB)
Write:
See page 93.
Reset:
$0006
Unimplemented
$0007
Unimplemented
Read:
Timer Status and Control
$0008
Register (TSCR)
Write:
See page 112.
Reset:
Figure 2-2. I/O Register Summary (Sheet 1 of 3)
MC68HC705J1A — Rev. 4.0
MOTOROLA
Bit 7
6
5
PA7
PA6
PA5
PA4
Unaffected by reset
0
0
PB5
PB4
Unaffected by reset
DDRA7
DDRA6
DDRA5
DDRA4
0
0
0
0
0
DDRB5
DDRB4
0
0
0
TOF
RTIF
TOIE
RTIE
0
0
0
= Unimplemented
R = Reserved
Memory

Input/Output Register Summary

4
3
2
1
PA3
PA2
PA1
PB3
PB2
PB1
DDRA3
DDRA2
DDRA1
0
0
0
0
DDRB3
DDRB2
DDRB1
0
0
0
0
0
0
RT1
TOFR
RTIFR
0
0
0
1
Technical Data
Memory
Bit 0
PA0
PB0
DDRA0
0
DDRB0
0
RT0
1
35

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