MC908AB32CFUE Datasheet, PDF (200/392 Pages) Freescale Semiconductor, Inc – Microcontrollers

Timer Interface Module B (TIMB)
Addr.
Register Name
$004A
Timer B Channel 1 ^Read:
Register Low Write:
(TBCH1L) _Reset:
Timer B Channel 2 Status ^Read:
$0032
and Control Register Write:
(TBSC2) _Reset:
$0033
Timer B Channel 2 ^Read:
Register High Write:
(TBCH2H) _Reset:
$0034
Timer B Channel 2 ^Read:
Register Low Write:
(TBCH2L) _Reset:
Timer B Channel 3 Status ^Read:
$0035
and Control Register Write:
(TBSC3) _Reset:
$0036
Timer B Channel 3 ^Read:
Register High Write:
(TBCH3H) _Reset:
$0037
Timer B Channel 3 ^Read:
Register Low Write:
(TBCH3L) _Reset:
Bit 7
Bit 7
CH2F
0
0
Bit 15
Bit 7
CH3F
0
0
Bit 15
Bit 7
6
5
4
3
2
6
5
4
3
2
Indeterminate after reset
CH2IE MS2B MS2A ELS2B ELS2A
0
0
0
0
0
14
13
12
11
10
Indeterminate after reset
6
5
4
3
2
CH3IE
Indeterminate after reset
0
MS3A ELS3B ELS3A
0
0
0
0
0
14
13
12
11
10
Indeterminate after reset
6
5
4
3
2
= Unimplemented
Indeterminate after reset
1
Bit 0
1
Bit 0
TOV2 CH2MAX
0
0
9
Bit 8
1
Bit 0
TOV3 CH3MAX
0
0
9
Bit 8
1
Bit 0
Figure 12-2. TIMB I/O Register Summary (Sheet 2 of 2)
12.5.2 Input Capture
With the input capture function, the TIMB can capture the time at which
an external event occurs. When an active edge occurs on the pin of an
input capture channel, the TIMB latches the contents of the TIMB
counter into the TIMB channel registers, TBCHxH:TBCHxL. The polarity
of the active edge is programmable. Input captures can generate
TIMB CPU interrupt requests.
Technical Data
200
Timer Interface Module B (TIMB)
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor