參數(shù)資料
型號: MC68HC11ED0MP3
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 3 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 67/108頁
文件大?。?/td> 1672K
代理商: MC68HC11ED0MP3
Resets and Interrupts
Arm/Reset COP Timer Circuitry Register
MC68HC11ED0 — Rev. 1.0
Technical Summary
Resets and Interrupts
5.5 Arm/Reset COP Timer Circuitry Register
Refer to Figure 5-2 for a description of the arm/reset COP timer circuitry
register (COPRST).
Write $55 to COPRST to arm COP watchdog clearing mechanism. Write
$AA to COPRST to reset COP watchdog. Refer to description of the
Table 5-2. COP Timer Rate Select
CR[1:0]
Rate
Selected
XTAL = 4.0 MHz
Timeout
– 0 ms,
+ 32.8 ms
XTAL = 8.0 MHz
Timeout
– 0 ms,
+ 16.4 ms
XTAL = 12.0 MHz
Timeout
– 0 ms,
+ 10.9 ms
0 0
215
÷ E
32.768 ms
16.384 ms
10.923 ms
0 1
217
÷ E
131.07 ms
65.536 ms
43.691 ms
1 0
219
÷ E
524.29 ms
262.14 ms
174.76 ms
1 1
221
÷ E
2.1 s
1.049 s
699.05 ms
E =
1.0 MHz
2.0 MHz
3.0 MHz
Address:
$003A
Bit 7
6
54321
Bit 0
Read:
Bit 7Bit 6Bit 6Bit 4Bit 3Bit 2Bit 1Bit 0
Write:
Reset:
00
000000
Figure 5-2. Arm/Reset COP Timer Circuitry Register (COPRST)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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