HD6433308 HITACHI [Hitachi Semiconductor], HD6433308 Datasheet - Page 180

• Manufacturer Part Number: HD6433308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

7.6 Application Notes
Application programmers should note that the following types of contention can occur in the 8-bit
timer.
(1) Contention between TCNT Write and Clear: If an internal counter clear signal is generated
during the T
is not performed.
Figure 7-13 shows this type of contention.
H’00
H’FF
TCORA
TCORB
TMO pin
3
state of a write cycle to the timer counter, the clear signal takes priority and the write
Internal Address
bus
Internal write
signal
Counter clear
signal
TCNT
Figure 7-13. TCNT Write-Clear Contention
Ø
Figure 7-12. Example of Pulse Output
TCNT
Write cycle: CPU writes to TCNT
T
1
N
TCNT address
166
T
2
Clear counter
T
3
Figure 7-13
H’00