HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 259

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

2. Changing the Clock Select Bits (CKS2 to CKS0): Software should stop the watchdog timer
(by clearing the TME bit to 0) before changing the value of the clock select bits. If the clock
select bits are modified while the watchdog timer is running, the timer count may be
incremented incorrectly.
ø
Internal address bus
Internal write signal
TCNT clock pulse
TCNT
Figure 13-6 TCNT Write-Increment Contention
Write cycle: CPU writes to TCNT
T
1
N
244
TCNT address
T
2
T
3
Counter write data
M