UPD789304 Datasheet, PDF (21/64 Pages) NEC – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD789304, 789306, 789314, 789316
Figure 5-7. Block Diagram of Watchdog Timer (WTM)
Internal bus
fCLK
2⁴
Prescaler
fCLK
2⁶
fCLK
2⁸
fCLK
2¹⁰
7-bit counter
Clear
3
WDTMK
WDTIF
INTWDT
maskable
interrupt request
RESET
INTWDT
non-maskable
interrupt request
WDCS2 WDCS1 WDCS0
RUN WDTM4 WDTM3
Watchdog timer clock
select register (WDCS)
Watchdog timer mode
register (WDTM)
Internal bus
Remark fCLK: fX or fCC
Data Sheet U14384EJ1V0DS
21