Figure 15.1 Block Diagram Of Wdt - Renesas H8S/2158 User Manual

Section 15 Watchdog Timer (WDT)
WOVI0
(Interrupt request signal)
Internal NMI
(Interrupt request signal*
RESO signal*
1
Internal reset signal* 1
WOVI1
(Interrupt request signal)
Internal NMI
(Interrupt request signal *
RESO signal *
1
Internal reset signal * 1
Legend:
TCSR_0 : Timer control/status register_0
TCNT_0 : Timer counter_0
TCSR_1 : Timer control/status register_1
TCNT_1 : Timer counter_1
Notes: 1. The RESO signal outputs the low level signal when the internal reset signal is generated due to a TCNT
overflow of either WDT_0 or WDT_1. The internal reset signal first resets the WDT in which the overflow
has occurred first.
2. The internal NMI interrupt signal can be independently output from either WDT_0 or WDT_1.
The interrupt controller does not distinguish the NMI interrupt request from WDT_0 from that from WDT_1.
Rev. 3.00 Jan 25, 2006 page 374 of 872
REJ09B0286-0300
Interrupt
control
Overflow
Reset
2
)
control
Module bus
Interrupt
Overflow
control
2
)
Reset
control
Module bus

Figure 15.1 Block Diagram of WDT

Clock
Clock
selection
TCNT_0 TCSR_0
WDT_0
Clock
Clock
selection
TCNT_1 TCSR_1
WDT_1
φ/2
φ/64
φ/128
φ/512
φ/2048
φ/8192
φ/32768
φ/131072
Internal clock
Bus
interface
φ/2
φSUB/2
φ/64
φSUB/4
φ/128
φSUB/8
φ/512
φSUB/16
φ/2048
φSUB/32
φ/8192
φSUB/64
φ/32768
φSUB/128
φ/131072
φSUB/256
Internal clock
Bus
interface