HD64336900G Datasheet, PDF (208/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

TCRW has been set to H'06. Compare match B and compare match C are used. The FTIOB pin is in the 1 output state,
and is set to the toggle output or the 0 output by compare match B.
When BCLR#2, @TCRW is executed to clear the TOC bit (the FTIOC signal is low) and compare match B occurs
at the same timing as shown below, the H'02 writing to TCRW has priority and compare match B does not drive the FTIOB signal low;
the FTIOB signal remains high.
Bit
7
6
5
4
3
2
1
0
TCRW
Set value
CCLR
0
CKS2
0
CKS1
0
CKS0
0
TOD
0
TOC
1
TOB
1
TOA
0
BCLR#2, @TCRW
(1) TCRW read operation: Read H'06
(2) Modify operation: Modify H'06 to H'02
(3) Write operation to TCRW: Write H'02
TCRW
write signal
Compare match
signal B
FTIOB pin
Expected output
Remains high because the 1 writing to TOB has priority
Figure 12.26 When Compare Match and Bit Manipulation Instruction to TCRW
Occur at the Same Timing
Rev. 1.00, 11/03, page 180 of 376