Tim Counter Prescaler; Input Capture - Motorola MC68HC908GP32 Technical Data Manual

Addr. Register Name
Timer 2 Channel 0
$0032 Register Low
(T2CH0L)
Timer 2 Channel 1 Status
$0033 and Control Register
(T2SC1)
Timer 2 Channel 1
$0034 Register High
(T2CH1H)
Timer 2 Channel 1
$0035 Register Low
(T2CH1L)
Figure 22-2. TIM I/O Register Summary (Sheet 3 of 3)

22.5.1 TIM Counter Prescaler

22.5.2 Input Capture

MC68HC908GP32 MC68HC08GP32
•
MOTOROLA
Freescale Semiconductor, Inc.
Bit 7 6
Read:
Bit 7 6
Write:
Reset:
Read: CH1F
CH1IE
Write: 0
Reset: 0 0
Read:
Bit 15 14
Write:
Reset:
Read:
Bit 7 6
Write:
Reset:
= Unimplemented
The TIM clock source can be one of the seven prescaler outputs. The
prescaler generates seven clock rates from the internal bus clock. The
prescaler select bits, PS[2:0], in the TIM status and control register
select the TIM clock source.
With the input capture function, the TIM can capture the time at which an
external event occurs. When an active edge occurs on the pin of an input
capture channel, the TIM latches the contents of the TIM counter into the
TIM channel registers, TCHxH:TCHxL. The polarity of the active edge is
programmable. Input captures can generate TIM CPU interrupt
requests.
Rev. 6
—
Timer Interface Module (TIM)
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5 4 3
5 4 3
Indeterminate after reset
0
MS1A ELS1B
0 0 0
13 12 11
Indeterminate after reset
5 4 3
Indeterminate after reset
Timer Interface Module (TIM)
Functional Description
2 1 Bit 0
2 1 Bit 0
ELS1A TOV1 CH1MAX
0 0 0
10 9 Bit 8
2 1 Bit 0
Technical Data
347