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Watchdog Timer
12-7
12.5 Description of Operation
Oscillation stabilization wait operation
The watchdog timer operates as an oscillation stabilization wait timer after the reset state is released or when the
microcontroller recovers from STOP mode (Fig. 12-5-1).
The watchdog timer operates in this capacity even if the WDCNE flag is "0".
When recovering from STOP mode, the watchdog timer operates as a counter of the number of bits specified by
WDCK2 to 0 (Fig. 12-5-2). The oscillation stabilization wait time can be selected from among times that are
calculated as follows:
Overflow cycle = 2
(n + WDCK x 2)
/(f x 10
3
) [ms]
Where, n = 16 (CKSEL pin is “H”) or n = 17 (CKSEL pin is “L”); WDCK = WDCK[2:0]; f: Oscillation
input frequency [unit: MHz]
An oscillation stabilization wait time of at least 14 ms is recommended.
If the WDCNE flag is "1", a non-maskable interrupt is not generated even when recovering from STOP mode.
Fig. 12-5-1 Operation Diagram 1: When Reset Is Released
Watchdog timer
count value
Overflow
(when CKSEL = “H” and the oscillating input frequency is 15 MHz)
Internal clock,
SYSCLK supply
enabled
SYSCLK 8 cycle width
17.476 ms
Oscillation stabilization
wait time
SYSCLK
Internal reset
RST pin
OSCI input
Содержание MN103001G/F01K
Страница 1: ...MICROCOMPUTER MN1030 MN103001G F01K LSI User s Manual Pub No 23101 050E ...
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Страница 7: ...14 A D Converter 15 I O Ports 16 Internal Flash Memory 17 Ordering Mask ROM Appendix 14 15 16 17 ...
Страница 8: ......
Страница 9: ...Table of Contents List of Figures and Tables 0 ...
Страница 26: ...xviii ...
Страница 27: ...1 0 1 General Specifications ...
Страница 35: ...2 CPU 2 ...
Страница 57: ...3 Extension Instruction Specifications 3 ...
Страница 96: ...Extension Instruction Specifications 3 40 ...
Страница 97: ...4 Memory Modes 3 4 ...
Страница 102: ...Memory Modes 4 6 ...
Страница 103: ...5 Operating Mode 5 ...
Страница 107: ...6 Clock Generator 6 13 ...
Страница 111: ...7 Internal Memory 7 ...
Страница 114: ...Internal Memory 7 4 ...
Страница 115: ...8 Bus Controller BC 8 ...
Страница 189: ...9 Interrupt Controller 9 ...
Страница 220: ...Interrupt Controller 9 32 ...
Страница 221: ...10 8 bit Timers 9 10 ...
Страница 254: ...8 bit Timers 10 34 ...
Страница 255: ...11 16 bit Timers 11 ...
Страница 292: ...16 bit Timers 11 38 ...
Страница 293: ...12 Watchdog Timer 11 12 ...
Страница 302: ...Watchdog Timer 12 10 ...
Страница 303: ...13 Serial Interface 13 ...
Страница 354: ...Serial Interface 13 52 ...
Страница 355: ...14 A D Converter 14 ...
Страница 367: ...15 I O Ports 15 ...
Страница 431: ...16 Internal Flash Memory 16 ...
Страница 439: ...17 17 Ordering Mask ROM ...
Страница 442: ...Ordering Mask ROM 17 4 ...
Страница 443: ...Appendix ...