Datasheet

Rev.6.00 Oct.28.2004 page 454 of 1016
REJ09B0138-0600H
13.1.2 Block Diagram
Figure 13-1 shows a block diagram of the WDT.
Overflow
Interrupt
control
WOVI
(interrupt request
signal)
WDTOVF
*2
Internal reset signal
*1
Reset
control
RSTCSR TCNT TSCR
ø/2
ø/64
ø/128
ø/512
ø/2048
ø/8192
ø/32768
ø/131072
Clock
Clock
select
Internal clock
sources
Bus
interface
Module bus
Legend:
TCSR:
TCNT:
RSTCSR:
Timer control/status register
Timer counter
Reset control/status register
Internal bus
WDT
Notes: 1. The type of internal reset signal depends on a register setting. Either power-on
reset or manual reset can be selected. Manual reset is only supported in the H8S/2357 ZTAT.
2. The WDTOVF pin function is not available in the F-ZTAT version, the H8S/2398, H8S/2394, H8S/2392,
or H8S/2390.
Figure 13-1 Block Diagram of WDT
13.1.3 Pin Configuration
Table 13-1 describes the WDT output pin.
Table 13-1 WDT Pin
Name Symbol I/O Function
Watchdog timer overflow WDTOVF* Output Outputs counter overflow signal in watchdog
timer mode
Note: * The WDTOVF pin function is not available in the F-ZTAT version, the H8S/2398, H8S/2394, H8S/2392 or
H8S/2390.