
Technical Data
MC68HC05K0 MC68HC05K1 — Rev. 2.0
32
Memory
MOTOROLA
Technical Data
Addr.
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
$0000
Port A Data Register
(PORTA)
Read:
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Write:
Reset:
Unaffected by reset
$0001
Port B Data Register
(PORTB)
Read:
0
PB1
PB0
Write:
Reset:
Unaffected by reset
$0002
Unimplemented
$0003
Unimplemented
$0004
Data Direction Register A
(DDRA)
Read:
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
Write:
Reset:
0
$0005
Data Direction Register B
(DDRB)
Read:
0
DDRB1
DDRB0
Write:
Reset:
0
$0006
Unimplemented
$0007
Unimplemented
$0008
Timer Status and Control
Register (TSCR)
Read:
TOF
RTIF
TOIE
RTIE
00
RT1
RT0
Write:
TOFR
RTIFR
Reset:
0
1
$0009
Timer Counter Register
(TCNTR)
Read:
TCR7
TCR6
TCR5
TCR4
TCR3
TCR2
TCR1
TCR0
Write:
Reset:
0
$000A
IRQ Status and Control
Register (ISCR)
Read:
IRQE
0
IRQF
0
Write:
IRQR
Reset:
1
0
U
0
= Unimplemented
R
= Reserved
U = Unaffected
Figure 2-2. Control, Status, and Data Registers (Sheet 1 of 2)