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CHAPTER 13 PWC TIMER
13.3 Movement of PWC Timer
■ Timer Cycle
If 0000
H
after 65536 times counted up to stop the count. The time period from the start to the stop is calculated by
the following expression:
T
=(65536-n
1
T
: Time from startup to stop (μs)
1
n
: Timer value written in the PWCR at the start
1
t: Count Clock cycle (μs)
If 0000
H
every 65536-time counted up. Reload cycle time is calculated by the following expression:
T
=(65536-n
R
T
: Reload cycle (overflow cycle) (μs)
R
n
: Reload value held in the PWCR
R
t: Count Clock cycle (μs)
■ Count Clock and Maximum Cycle
Maximum cycle is provided when 0000
The count clock cycle and the maximum cycle of the timer are shown in Table 13.3-5 when the machine
clock frequency (called φ hereafter) is 24 MHz.
Table 13.3-5 Count Clock and Cycle
Count clock selection
Count Clock Cycle
Timer maximum cycle
308
is set to the PWCR in the one-shot operation mode and the timer is started, an overflow occurs
) × t
1
is set to the PWCR in the reload operation mode and the timer is started, an overflow occurs at
) × t
R
in CSK1,CSK0=00:(φ/4)
0.17 μs
10.92 ms
FUJITSU MICROELECTRONICS LIMITED
is set for the PWCR value in the timer mode.
H
in CSK1,CSK0=00:(φ/16)
0.67 μs
43.7 ms
MB90335 Series
in CSK1,CSK0=00:(φ/32)
1.33 μs
87.4 ms
CM44-10137-6E
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