HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 276

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

9.5.8
The following types of contention can occur in timer X operation.
1. Contention between FRC write and counter clear
268
If an FRC clear signal is generated in the T
clearing takes precedence and the write to the counter is not carried out. Figure 9.32 shows the
timing.
Application Notes
ø
Address
Internal write
signal
Counter clear
signal
FRC
Figure 9.32 Contention between FRC Write and Clear
FRC lower byte write cycle
T
1
3
state of a write cycle to the lower byte of FRC,
N
FRC address
T
2
T
3
H'0000