HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 366

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

11.
11.7.3
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:
Where
11.7.4
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 11.71 shows the timing in this case.
Rev.4.00 Mar. 27, 2008 Page 322 of 882
REJ09B0108-0400
Multi-Function Timer Pulse Unit (MTU)
f =
Caution on Period Setting
Contention between TCNT Write and Clear Operations
f:
Pφ: Peripheral clock operating frequency
N: TGR set value
Figure 11.71
(N + 1)
Pφ
Address
Write signal
Counter clear
signal
TCNT
Pφ
Counter frequency
Contention between TCNT Write and Clear Operations
TCNT write cycle
N
TCNT address
T1
T2
H'0000