MC68HC05P18A Datasheet, PDF (66/130 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

16-Bit Timer
Freescale Semiconductor, Inc.
Technical Data
Address:
Read:
Write:
Reset:
$0018
Bit 7
TMRH7
1
6
TMRH6
1
5
TMRH5
1
4
TMRH4
1
3
TMRH3
1
2
TMRH2
1
1
TMRH1
1
Bit 0
TMRH0
1
Address: $0019
Bit 7
6
5
4
3
2
1
Read: TMRL7 TMRL6 TMRL5 TMRL4 TMRL3 TMRL2 TMRL1
Write:
Reset: 1
1
1
1
1
1
1
= Unimplemented
Figure 8-2. Timer Counter Registers (TMRH/TMRL)
Bit 0
TMRL0
1
Address:
Read:
Write:
Reset:
$001A
Bit 7
ACRH7
1
6
ACRH6
1
5
ACRH5
1
4
ACRH4
1
3
ACRH3
1
2
ACRH2
1
1
ACRH1
1
Bit 0
ACRH0
1
Address: $001B
Bit 7
6
5
4
3
2
1
Bit 0
Read: ACRL7 ACRL6 ACRL5 ACRL4 ACRL3 ACRL2 ACRL1 ACRL0
Write:
Reset: 1
1
1
1
1
1
1
1
= Unimplemented
Figure 8-3. Alternate Counter Registers (ACRH/ACRL)
The timer registers and alternate counter registers can be read at any
time without affecting their values. However, the alternate counter
registers differ from the timer registers in one respect: A read of the timer
register MSB can clear the timer overflow flag (TOF). Therefore, the
alternate counter registers can be read at any time without the possibility
16-Bit Timer
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MC68HC05P18A