MC68HC705KJ1 Datasheet, PDF (23/108 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Input/Output Register Summary
2.5 Input/Output Register Summary
Addr.
$0000
$0001
Register Name
Bit 7
Port A Data Register ^Read: _PA7
(PORTA) Write:
See page 64. _Reset:
Port B Data Register ^Read:
0
(PORTB) Write:
See page 66. _Reset:
6
5
4
3
PA6
PA5
PA4
PA3
Unaffected by reset
0
Refer to Chapter 7 Paral-
lel I/O Ports (PORTS)
PB3
Unaffected by reset
2
1
Bit 0
PA2
PA1
PA0
PB2
Refer to Chapter 7 Paral-
lel I/O Ports (PORTS)
$0002
Unimplemented
$0003
Unimplemented
$0004
$0005
Data Direction Register A ^Read:
(DDRA) Write:
See page 64. _Reset:
DDRA7
0
Data Direction Register B ^Read:
0
(DDRB) Write:
See page 67. _Reset:
0
DDRA6 DDRA5 DDRA4 DDRA3
0
0
0
0
0
Refer to Chapter 7 Paral-
lel I/O Ports (PORTS)
DDRB3
0
0
0
0
DDRA2 DDRA1 DDRA0
0
0
0
DDRB2
Refer to Chapter 7 Paral-
lel I/O Ports (PORTS)
0
0
0
$0006
Unimplemented
$0007
Unimplemented
$0008
Timer Status and Control ^Read:
Register (TSCR) Write:
See page 81. _Reset:
$0009
Timer Counter Register ^Read:
(TCR) Write:
See page 82. _Reset:
IRQ Status and Control Reg- ^Read:
$000A
ister (ISCR) Write:
See page 54. _Reset:
TOF
0
TCR7
0
IRQE
1
RTIF
0
TCR6
0
0
0
TOIE
0
TCR5
0
0
0
RTIE
0
TCR4
0
0
R
0
0
TOFR
0
TCR3
0
RTIFR
0
TCR2
0
0
IRQF
0
0
0
RT1
1
TCR1
0
0
IRQR
0
RT0
1
TCR0
0
0
0
= Unimplemented
R = Reserved
U = Unaffected
Figure 2-2. I/O Register Summary (Sheet 1 of 2)
MC68HC705KJ1 • MC68HRC705KJ1 • MC68HLC705KJ1 Data Sheet, Rev. 4.1
Freescale Semiconductor
23