HD404339 Datasheet, PDF (47/80 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer with large-capacity memory

Watchdog on
flag (WDON)
HD404339 Series
Watchdog timer
controller
System reset signal
Interrupt request
flag of timer C
(IFTC)
TOC
System ^øPER
clock
Timer read register CU (TRCU)
Timer output
control logic
Clock
Timer
output
control
signal
Timer read
register C lower
(TRCL)
Timer counter C
(TCC)
Overflow
Timer write
register C upper
(TWCU)
Selector
Prescaler S (PSS)
Free-running
timer control
signal
3
Timer write
register C lower
(TWCL)
Timer mode
register C (TMC)
Port mode
register A (PMRA)
Figure 33 Timer C Block Diagram
45