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參數(shù)資料
| 型號： | S1C63653F |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, CQFP100 |
| 封裝： | CERAMIC, QFP15-100 |
| 文件頁數(shù)： | 53/121頁 |
| 文件大小： | 1127K |
| 代理商： | S1C63653F |
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S1C63653 TECHNICAL MANUAL
EPSON
29
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Watchdog Timer)
4.3.3 I/O memory of watchdog timer
Table 4.3.3.1 shows the I/O address and control bits for the watchdog timer.
Table 4.3.3.1 Control bits of watchdog timer
Address
Comment
D3
D2
Register
D1
D0
Name
Init 1
10
FF07H
00
WDEN WDRST
R/W
W
R
0 3
WDEN
WDRST3
– 2
1
Reset
Enable
Reset
Disable
Invalid
Unused
Watchdog timer enable
Watchdog timer reset (writing)
*1 Initial value at initial reset
*2 Not set in the circuit
*3 Constantly "0" when being read
WDEN: Watchdog timer enable register (FF07HD1)
Selects whether the watchdog timer is used (enabled) or not (disabled).
When "1" is written: Enabled
When "0" is written: Disabled
Reading: Valid
When "1" is written to the WDEN register, the watchdog timer starts count operation. When "0" is written,
the watchdog timer does not count and does not generate the interrupt (NMI).
At initial reset, this register is set to "1".
WDRST: Watchdog timer reset (FF07HD0)
Resets the watchdog timer.
When "1" is written: Watchdog timer is reset
When "0" is written: No operation
Reading: Always "0"
When "1" is written to WDRST, the watchdog timer is reset and restarts immediately after that. When "0"
is written, no operation results.
This bit is dedicated for writing, and is always "0" for reading.
4.3.4 Programming notes
(1) When the watchdog timer is being used, the software must reset it within 3-second cycles.
(2) Because the watchdog timer is set in operation state by initial reset, set the watchdog timer to disabled
state (not used) before generating an interrupt (NMI) if it is not used.
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