HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 236

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

11.6 Application Notes
Application programmers should note that the following types of contention can occur in the 8-bit
timer.
Contention between TCNT Write and Clear: If an internal counter clear signal is generated
during the T
is not performed.
Figure 11-9 shows this type of contention.
3
state of a write cycle to the timer counter, the clear signal takes priority and the write
ø
Internal Address
bus
Internal write
signal
Counter clear
signal
TCNT
Figure 11-9 TCNT Write-Clear Contention
Write cycle: CPU writes to TCNT
T
1
220
N
TCNT address
T
2
T
3
H'00