Section 9 Multi-Function Timer Pulse Unit 2 (MTU2)
Rev. 3.00 Sep. 27, 2007 Page 333 of 758
REJ09B0243-0300
9.7.3
Caution on Period Setting
When counter clearing on compare match is set, TCNT is cleared in the final state in which it
matches the TGR value (the point at which the count value matched by TCNT is updated).
Consequently, the actual counter frequency is given by the following formula:
•
Channels 0 to 4
f =
MP
φ
(N + 1)
•
Channel 5
f =
MP
φ
N
Where f: Counter
frequency
MP
φ
: MTU2 peripheral clock operating frequency
N:
TGR set value
9.7.4
Contention between TCNT Write and Clear Operations
If the counter clear signal is generated in the T2 state of a TCNT write cycle, TCNT clearing takes
precedence and the TCNT write is not performed.
Figure 9.108 shows the timing in this case.
Counter clear
signal
Write signal
Address
TCNT address
TCNT
TCNT write cycle
T1
T2
N
H'0000
MP
φ
Counter clear
signal
Write signal
Address
TCNT address
TCNT
TCNT write cycle
T1
T2
N
H'0000
MP
φ
Figure 9.108 Contention between TCNT Write and Clear Operations
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