h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 438

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 14 Watchdog Timer (WDT)
14.4
During interval timer mode operation, an overflow generates an interval timer interrupt (WOVI).
The interval timer interrupt is requested whenever the OVF flag is set to 1 in TCSR. OVF must be
cleared to 0 in the interrupt handling routine. When NMI interrupt request generation is selected in
watchdog timer mode, an overflow generates an NMI interrupt request.
14.5
14.5.1
If a timer counter clock pulse is generated during the T
takes priority and the timer counter is not incremented. Figure 14.6 shows this operation.
Rev. 4.00 Jun 06, 2006 page 384 of 1004
REJ09B0301-0400
Interrupts
Usage Notes
Contention between Timer Counter (TCNT) Write and Increment
Address
Internal write signal
TCNT input clock
TCNT
Figure 14.6 Contention between TCNT Write and Increment
TCNT write cycle
T
1
N
2
T
state of a TCNT write cycle, the write
2
Counter write data
M