Rev. 6.00, 08/04, page 317 of 628
Figure 9.23 shows an example of the operation of this function.
Clock stopped
N+2
N+3
N+4
N+5
N+6
N
N+1
Edge generated by clock return
Input event
IRQAEC or
IECPWM
Actually counted
clock source
Counter value
Figure 9.23 Example of Clock Control Operation
9.7.4
Asynchronous Event Counter Operation Modes
Asynchronous event counter operation modes are shown in table 9.21.
Table 9.21
Asynchronous Event Counter Operation Modes
Operation
Mode
Reset
Active
Sleep
Watch
Subactive
Subsleep
Standby
Module
Standby
AEGSR
Reset
Functions Functions
Retained
*
1
Functions
Functions
Retained
*
1
Retained
ECCR
Reset
Functions Functions
Retained
*
1
Functions
Functions
Retained
*
1
Retained
ECCSR
Reset
Functions Functions
Retained
*
1
Functions
Functions
Retained
*
1
Retained
ECH
Reset
Functions Functions
Functions
*
1
*
2
Functions
*
2
Functions
*
2
Functions
*
1
*
2
Halted
ECL
Reset
Functions Functions
Functions
*
1
*
2
Functions
*
2
Functions
*
2
Functions
*
1
*
2
Halted
IRQAEC
Reset
Functions Functions
Retained
*
3
Functions
Functions
Retained
*
3
Retained
*
4
Event
counter
PWM
Reset
Functions Functions
Retained
Retained
Retained
Retained
Retained
Notes: 1. When an asynchronous external event is input, the counter increments but the counter
overflow H/L flags are not affected.
2. Operates when asynchronous external events are selected; halted and retained
otherwise.
3. Clock control by IRQAEC operates, but interrupts do not.
4. As the clock is stopped in module standby mode, IRQAEC has no effect.
Summary of Contents for H8/38024 Series
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