Basic Interval Timer/Watchdog Timer - NEC MuPD754202 Datasheet

6.3 Basic Interval Timer/Watchdog Timer

The basic interval timer/watchdog timer has the following functions.
(a) Interval timer operation to generate a reference time interrupt
(b) Watchdog timer operation to detect a runaway of program and reset the CPU
(c) Selects and counts the wait time when the standby mode is released
(d) Reads the contents of counting
Figure 6-2. Basic Interval Timer/Watchdog Timer Block Diagram
From clock
generator
5
f /2
X
7
f /2
X
MPX
9
f /2
X
12
f /2
X
3
BTM3 BTM2 BTM1 BTM0 BTM
4
Note
SET1
Note Instruction execution
Clear
Basic interval timer
(8-bit frequency divider)
BT
Wait release signal
when standby is
released.
8
Internal bus
µ PD754202, 754202(A)
Clear
BT
Set
interrupt
request flag
IRQBT
Internal reset
signal
WDTM
Note
SET1
1
Vectored
interrupt
request signal
19