MC68HC08AZ0 Datasheet, PDF (271/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
Timer Interface Module A (TIMA)
I/O registers
Bit 7
6
5
4
3
2
1
TACNTH ^{Read: Bit 15}
14
13
12
11
10
9
$0022 _Write:
Reset: 0
0
0
0
0
0
0
Bit 7
6
5
4
3
2
1
TACNTL ^{Read: Bit 7}
6
5
4
3
2
1
$0023 _Write:
0
0
0
0
0
0
0
Reset:
= Unimplemented
Figure 4. TIMA counter registers (TACNTH:TACNTL)
Bit 0
Bit 8
0
Bit 0
Bit 0
0
TIMA counter
modulo registers
(TAMODH/L)
The read/write TIMA modulo registers contain the modulo value for the
TIMA counter. When the TIMA counter reaches the modulo value, the
overflow flag (TOF) becomes set, and the TIMA counter resumes
counting from $0000 at the next clock. Writing to the high byte
(TAMODH) inhibits the TOF bit and overflow interrupts until the low byte
(TAMODL) is written. Reset sets the TIMA counter modulo registers.
Bit 7
6
5
4
3
2
1
Bit 0
TAMODH
$0024
Read:
Write:
Bit 15
14
13
12
11
10
9
Bit 8
Reset: 1
1
1
1
1
1
1
1
Bit 7
6
5
4
3
2
1
Bit 0
TAMODL ^Read:
$0025 _Write:
Bit 7
6
5
4
3
2
1
Bit 0
Reset: 1
1
1
1
1
1
1
1
Figure 5. TIMA counter modulo registers (TAMODH:TAMODL)
NOTE: Reset the TIMA counter before writing to the TIMA counter modulo
registers.
19-tima
MOTOROLA
Timer Interface Module A (TIMA)
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MC68HC08AZ0
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