mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 391

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

SYPCR — System Protection Control Register
D.2.15 System Protection Control Register
SWE — Software Watchdog Enable
SWP — Software Watchdog Prescaler
SWT[1:0] — Software Watchdog Timing
MC68HC16Y3/916Y3
USER’S MANUAL
15
RESET:
This register controls system monitor functions, software watchdog clock prescaling,
and bus monitor timing. This register can be written once following power-on or reset.
Bits [15:8] are unimplemented and will always read zero.
This bit controls the value of the software watchdog prescaler.
The reset value of SWP is the complement of the state of the MODCLK pin during
reset.
This field selects the divide ratio used to establish the software watchdog timeout
period. Refer to Table D-6.
0 = Software watchdog is disabled.
1 = Software watchdog is enabled.
0 = Software watchdog clock is not prescaled.
1 = Software watchdog clock is prescaled by 512.
NOT USED
PFPAR Field
Freescale Semiconductor, Inc.
PFPA7
PFPA6
PFPA5
PFPA4
PFPA3
PFPA2
PFPA1
PFPA0
For More Information On This Product,
Table D-5 Port F Pin Assignments
Go to: www.freescale.com
REGISTER SUMMARY
Port F Signal
PF7
PF6
PF5
PF4
PF3
PF2
PF1
PF0
8
SWE
7
1
MODCLK
Alternate Signal
SWP
6
FASTREF
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
IRQ2
IRQ1
5
0
SWT[1:0]
4
0
HME
3
0
BME
2
0
$YFFA20
MOTOROLA
1
0
BMT[1:0]
D-13
0
0