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Watchdog Timer
12-9
Watchdog operation
If the WDCNE flag is set to "1" and the watchdog operation is enabled, a non-maskable interrupt is generated if a
watchdog timer overflow occurs.
When an overflow occurs, the watchdog timer overflow output is output to the WDOVF flag. Pulse output or level
output can be selected through the WDOVT flag. When level output is selected, the watchdog timer overflow
output (WDOVF flag) is cleared by writing a "1" to the WDRST flag or by reset (RST) pin "L" level input.
Fig. 12-5-3 Operation Diagram 3: Watchdog Operation
Before setting the WDCNE flag to "1", write a "1" to the WDRST flag to reset the counter.
When switching to HALT or SLEEP mode, set the WDCNE flag to "0" to turn off the watchdog timer.
Self-reset operation
The chip resets internally when a "1" is written to the CHIPRST bit in the RSTCTR register. The oscillation
stabilization wait operation is not performed.
The reset generated by writing the CHIPRST flag is an internal reset signal within the chip and does not manifest
itself on the external reset pin (RST pin).
Watchdog timer
count value
Overflow
4.369 ms to 1118.481 ms
(when CKSEL = “H” and the oscillating input
frequency is 15 MHz)
Counter reset by writing
“1” to the WDRST flag
Non-maskable interrupt
WDOVF flag output
(when pulse output is
selected)
WDOVF flag output
(when level output is
selected)
SYSCLK 255-cycle width
Reset by writing a “1”
to the WDRST flag, or
by reset pin input
Summary of Contents for MN103001G/F01K
Page 1: ...MICROCOMPUTER MN1030 MN103001G F01K LSI User s Manual Pub No 23101 050E ...
Page 2: ......
Page 4: ......
Page 6: ......
Page 8: ......
Page 9: ...Table of Contents List of Figures and Tables 0 ...
Page 26: ...xviii ...
Page 27: ...1 0 1 General Specifications ...
Page 35: ...2 CPU 2 ...
Page 57: ...3 Extension Instruction Specifications 3 ...
Page 96: ...Extension Instruction Specifications 3 40 ...
Page 97: ...4 Memory Modes 3 4 ...
Page 102: ...Memory Modes 4 6 ...
Page 103: ...5 Operating Mode 5 ...
Page 107: ...6 Clock Generator 6 13 ...
Page 111: ...7 Internal Memory 7 ...
Page 114: ...Internal Memory 7 4 ...
Page 115: ...8 Bus Controller BC 8 ...
Page 189: ...9 Interrupt Controller 9 ...
Page 220: ...Interrupt Controller 9 32 ...
Page 221: ...10 8 bit Timers 9 10 ...
Page 254: ...8 bit Timers 10 34 ...
Page 255: ...11 16 bit Timers 11 ...
Page 292: ...16 bit Timers 11 38 ...
Page 293: ...12 Watchdog Timer 11 12 ...
Page 302: ...Watchdog Timer 12 10 ...
Page 303: ...13 Serial Interface 13 ...
Page 354: ...Serial Interface 13 52 ...
Page 355: ...14 A D Converter 14 ...
Page 367: ...15 I O Ports 15 ...
Page 431: ...16 Internal Flash Memory 16 ...
Page 439: ...17 17 Ordering Mask ROM ...
Page 442: ...Ordering Mask ROM 17 4 ...
Page 443: ...Appendix ...