REGISTER SUMMARY
MC68332
D-10
USER’S MANUAL
D.2.12 SYPCR
— System Protection Control Register
$YFFA21
SYPCR controls system monitor functions, software watchdog clock prescaling, and
bus monitor timing. This register can be written once following power-on or reset.
SWE — Software Watchdog Enable
0 = Software watchdog disabled
1 = Software watchdog enabled
SWP — Software Watchdog Prescale
0 = Software watchdog clock not prescaled
1 = Software watchdog clock prescaled by 512
SWT[1:0] — Software Watchdog Timing
This field selects software watchdog time-out period.
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 bus monitor time-out period.
15
8
7
6
5
4
3
2
1
0
NOT USED
SWE
SWP
SWT
HME
BME
BMT
RESET:
1
MODCLK
0
0
0
0
0
0
Software Watchdog Ratio
SWP
SWT Ratio
0
00
2
9
0
01
2
11
0
10
2
13
0
11
2
15
1
00
2
18
1
01
2
20
1
10
2
22
1
11
2
24
Bus Monitor Period
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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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