参数资料
型号: MC68332ACEH20
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 20 MHz, MICROCONTROLLER, PQFP132
封装: 0.950 X 0.950 INCH, 0.025 INCH PITCH, PLASTIC, ROHS COMPLIANT, QFP-132
文件页数: 23/109页
文件大小: 787K
代理商: MC68332ACEH20
MOTOROLA
MC68332
20
MC68332TS/D
3.2.2 System Protection Control Register
The system protection control register controls system monitor functions, software watchdog clock
prescaling, and bus monitor timing. This register can be written only once following power-on or reset,
but can be read at any time.
SWE — Software Watchdog Enable
0 = Software watchdog disabled
1 = Software watchdog enabled
SWP — Software Watchdog Prescale
This bit controls the value of the software watchdog prescaler.
0 = Software watchdog clock not prescaled
1 = Software watchdog clock prescaled by 512
SWT[1:0] — Software Watchdog Timing
This field selects the divide ratio used to establish software watchdog time-out period. The following ta-
ble gives the ratio for each combination of SWP and SWT bits.
HME — Halt Monitor Enable
0 = Disable halt monitor function
1 = Enable halt monitor function
BME — Bus Monitor External Enable
0 = Disable bus monitor function for an internal to external bus cycle.
1 = Enable bus monitor function for an internal to external bus cycle.
BMT[1:0] — Bus Monitor Timing
This field selects a bus monitor time-out period as shown in the following table.
SYPCR —System Protection Control Register
$YFFA21
15
8
7
6
5
4
3
2
1
0
NOT USED
SWE
SWP
SWT
HME
BME
BMT
RESET:
1
MODCLK
0
SWP
SWT
Ratio
000
29
001
211
010
213
011
215
100
218
101
220
110
222
111
224
BMT
Bus Monitor Time-out Period
00
64 System Clocks
01
32 System Clocks
10
16 System Clocks
11
8 System Clocks
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For More Information On This Product,
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相关代理商/技术参数
参数描述
MC68332ACEH20 制造商:Freescale Semiconductor 功能描述:32-Bit Microcontroller IC
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