HD6433935 Hitachi, HD6433935 Datasheet - Page 226
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HD6433935
Manufacturer Part Number
HD6433935
Description
8-Bit MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6433935.pdf
(521 pages)
- Current page: 226 of 521
- Download datasheet (2Mb)
All above attentions are also applied in 16-bit mode and 8-bit mode.
4. Timer counter (TCF) read/write
When øw/4 is selected as the internal clock in active (high-speed, medium-speed) mode, write on
TCF is impossible. And, when read 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.
When read/write TCF in active (high-speed, medium-speed) mode is needed, please select internal
clock except for øw/4 before read/write.
In subactive mode, even øw/4 is selected as the internal clock, normal read/write TCF is possible.
214
Interrupt factor
generation signal
(Internal signal,
nega-active)
Overflow signal,
Compare match signal
(Internal signal,
nega-active)
Interrupt request flag
(IRRTFH, IRRTFL)
Program process
øw
Figure 9-7 Clear Interrupt Request Flag when Interrupt Factor Generation Signal is Valid
3. After read timer control status register F (TCSRF), clear timer overflow flags (OVFH,
4. Operate interrupt permission (set IENFH, IENFL to 1).
Method 2
1. Set interrupt handling routine time to more than time that calculated with (1) formula.
2. Clear interrupt request flags (IRRTFH, IRRTFL) at the end of interrupt handling routine.
3. After read timer control status register F (TCSRF), clear timer overflow flags (OVFH,
OVFL) and compare match flags (CMFH, CMFL).
OVFL) and compare match flags (CMFH, CMFL).
Interrupt
Interrupt request
flag clear
1
2
Interrupt
Interrupt request
flag clear
Normal
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