UPD753012GC NEC, UPD753012GC Datasheet - Page 25

• Manufacturer Part Number: UPD753012GC
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

6.5 Basic Interval Timer/Watchdog Timer
SET1
The basic interval timer/watchdog timer has the following functions.
• Interval timer operation to generate a reference time interrupt
• Watchdog timer operation to detect a runaway of program and reset the CPU
• Selects and counts the wait time when the standby mode is released
• Reads the contents of counting
From clock
generator
f
X
f
f
f
X
X
X
/2
Note
Note Instruction execution
/2
/2
/2
BTM3 BTM2 BTM1 BTM0 BTM
12
5
7
9
4
MPX
Figure 6-4. Basic Interval Timer/Watchdog Timer Block Diagram
3
(8-bit frequency divider)
Basic interval timer
Internal bus
8
Clear
Wait release signal
when standby is
released.
BT
PD753012, 753016, 753017
WDTM
1
SET1
Set
Note
BT
interrupt
request flag
IRQBT
Clear
Internal reset
signal
Vectored
interrupt
request signal
25