參數(shù)資料
型號: MC68HC705C9ACP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: Microcontrollers
中文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 63/160頁
文件大?。?/td> 2076K
代理商: MC68HC705C9ACP
Resets
MC68HC05C12A Compatible COP
MC68HC705C9A — Rev. 4.0
Advance Information
MOTOROLA
Resets
63
CM1 — COP Mode Bit 1
Used in conjunction with CM0 to establish the COP timeout period,
this bit is readable any time. COPE, CM1, and CM0 together may be
written with a single write, only once, after reset. This bit is cleared by
reset.
CM0 — COP Mode Bit 0
Used in conjunction with CM1 to establish the COP timeout period,
this bit is readable any time. COPE, CM1, and CM0 together may be
written with a single write, only once, after reset. This bit is cleared by
reset.
Bits 7–5 — Not Used
These bits always read as 0.
5.7 MC68HC05C12A Compatible COP
This COP is implemented with an 18-bit ripple counter. This provides a
timeout period of 64 milliseconds at a bus rate (f
op
) of 2 MHz. If the COP
should time out, a system reset will occur and the device will be re-
initialized in the same fashion as a power-on reset or reset.
Table 5-1. COP Timeout Period
CM1
CM0
f
op
/2
15
Divide By
Timeout Period
(f
osc
= 2.0 MHz)
Timeout Period
(f
osc
= 4.0 MHz)
0
0
1
32.77 ms
16.38 ms
0
1
4
131.07 ms
65.54 ms
1
0
16
524.29 ms
262.14 ms
1
1
64
2.097 sec
1.048 sec
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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