Datasheet

Table Of Contents
Section 12 Timer F
Rev. 2.00 Jul. 04, 2007 Page 251 of 692
REJ09B0309-0200
φ
W
Program processing
Interrupt source generation
signal (internal signal,
nega-active)
Overflow signal, compare
match signal (internal signal,
nega-active)
Interrupt request flag
(IRRTFH, IRRTFL)
Interrupt
Normal
Interrupt request
flag clear
2
Interrupt
Interrupt request
flag clear
1
Figure 12.7 Clear Interrupt Request Flag when
Interrupt Source Generation Signal is Valid
12.6.4 Timer Counter (TCF) Read/Write
When the internal clock φ
W
/4 is selected as the counter input clock in active (high-speed, medium-
speed) mode, normal write is not performed on TCF. And when reading TCF, as the system clock
and internal clock are mutually asynchronous, TCF synchronizes with synchronization circuit.
This results in a maximum TCF read value error of ±1.
In subactive mode, even if φ
W
/4 is selected as the input clock, TCF can be read from or written to
normally.