540
13.6
Usage Notes
Application programmers should note that the following kinds of contention can occur in the 8-bit
timer.
13.6.1
Contention between TCNT Write and Clear
If a timer counter clock pulse is generated during the T2 state of a TCNT write cycle, the clear
takes priority, so that the counter is cleared and the write is not performed.
Figure 13-10 shows this operation.
ø
Address
TCNT address
Internal write signal
Counter clear signal
TCNT
N
H'00
T1
T2
TCNT write cycle by CPU
Figure 13-10 Contention between TCNT Write and Clear
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...