h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 438

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 14 Watchdog Timer (WDT)
14.1.2
Figures 14.1 (a) and (b) show block diagrams of WDT0 and WDT1.
Rev. 3.00 Jan 18, 2006 page 410 of 1044
REJ09B0280-0300
Legend:
TCSR: Timer control/status register
TCNT: Timer counter
WOVI0
(interrupt request
signal)
Internal NMI
interrupt request
signal
Notes: 1. RESO pin output goes low when the internal reset signal is generated by overflow of TCNT
RESO signal
Internal reset
signal
*2
Block Diagram
2. The internal NMI interrupt request signal can be output independently by either WDT0 or
*1
in either WDT0 or WDT1. The reset of the WDT that overflowed first takes precedence over
the internal reset signal.
WDT1. The interrupt controller does not distinguish between NMI interrupt requests from
WDT0 and WDT1.
*1
Figure 14.1 (a) Block Diagram of WDT0
Interrupt
control
control
Reset
Overflow
Module bus
TCNT
Clock
WDT0
select
Clock
TCSR
Internal clock
source
interface
Bus
/2
/64
/128
/512
/2048
/8192
/32768
/131072