mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 227

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

D.3.12 SYPCR — System Protection Control Register
SWE — Software Watchdog Enable
SWP — Software Watchdog Prescale
SWT[1:0] — Software Watchdog Timing
HME — Halt Monitor Enable
MC68331
USER’S MANUAL
15
RESET:
SYPCR controls system monitor functions, software watchdog clock prescaling, and
bus monitor timing. This register can be written once following power-on or reset.
This field selects software watchdog time-out period.
0 = Software watchdog disabled
1 = Software watchdog enabled
0 = Software watchdog clock not prescaled
1 = Software watchdog clock prescaled by 512
0 = Disable halt monitor function
1 = Enable halt monitor function
NOT USED
Freescale Semiconductor, Inc.
Table D-6 Software Watchdog Ratio
PFPAR Field
For More Information On This Product,
Table D-5 Port F Pin Assignments
PFPA7
PFPA6
PFPA5
PFPA4
PFPA3
PFPA2
PFPA1
PFPA0
SWP
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0
0
0
0
1
1
1
1
REGISTER SUMMARY
Port F Signal
8
SWT
PF7
PF6
PF5
PF4
PF3
PF2
PF1
PF0
00
01
10
11
00
01
10
11
SWE
7
1
MODCLK
SWP
Ratio
6
2
2
2
2
2
2
2
Control Signal
2
11
13
15
18
20
22
24
9
MODCLK
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
IRQ2
IRQ1
5
0
SWT
4
0
HME
3
0
BME
2
0
$YFFA21
1
0
BMT
D-19
0
0
D