YR0K42378FC000BA Renesas Electronics America, YR0K42378FC000BA Datasheet - Page 752

Manufacturer Part Number

YR0K42378FC000BA

KIT EVAL FOR H8S/2378

Manufacturer

Renesas Electronics America

For Use With/related Products

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Section 14 Watchdog Timer (WDT)

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.

Table 14.2 WDT Interrupt Source

The watchdog timer’s TCNT, TCSR, and RSTCSR registers differ from other registers in being

more difficult to write to. The procedures for writing to and reading these registers are given

Writing to TCNT, TCSR, and RSTCSR

TCNT and TCSR must be written to by a word transfer instruction. They cannot be written to by a

byte transfer instruction.

Rev.7.00 Mar. 18, 2009 page 684 of 1136

REJ09B0109-0700

WOVI: Interval timer interrupt request generation

Interrupt Source

Notes on Register Access

Interrupt Source

TCNT overflow

Figure 14.3 Operation in Interval Timer Mode

Interrupt Flag

DTC Activation