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Chapter 8 S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V6)
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor
301
8.5.5
Computer Operating Properly Watchdog (COP) Reset
The COP (free running watchdog timer) enables the user to check that a program is running and
sequencing properly. When the COP is being used, software is responsible for keeping the COP from
timing out. If the COP times out it is an indication that the software is no longer being executed in the
intended sequence; thus COP reset is generated.
The clock source for the COP is either ACLK, IRCCLK or OSCCLK depending on the setting of the
COPOSCSEL0 and COPOSCSEL1 bit.
Depending on the COP configuration there might be a significant latency time until COP is active again
after exit from Stop Mode due to clock domain crossing synchronization. This latency time occurs if COP
clock source is ACLK and the CSAD bit is set (please refer to CSAD bit description for details).
gives an overview of the COP condition (run, static) in Stop Mode depending on legal
configuration and status bit settings:
Table 8-34. COP condition (run, static) in Stop Mode
Three control bits in the CPMUCOP register allow selection of seven COP time-out periods.
When COP is enabled, the program must write $55 and $AA (in this order) to the CPMUARMCOP
register during the selected time-out period. Once this is done, the COP time-out period is restarted. If the
program fails to do this and the COP times out, a COP reset is generated. Also, if any value other than $55
or $AA is written, a COP reset is generated.
COPOSCSEL1 CSAD PSTP
PCE
COPOSCSEL0
OSCE
UPOSC
COP counter behavior in Stop Mode
(clock source)
1
0
x
x
x
x
x
Run (ACLK)
1
1
x
x
x
x
x
Static (ACLK)
0
x
1
1
1
1
1
Run (OSCCLK)
0
x
1
1
0
0
x
Static (IRCCLK)
0
x
1
1
0
1
x
Static (IRCCLK)
0
x
1
0
0
x
x
Static (IRCCLK)
0
x
1
0
1
1
1
Static (OSCCLK)
0
x
0
1
1
1
1
Static (OSCCLK)
0
x
0
1
0
1
x
Static (IRCCLK)
0
x
0
1
0
0
0
Static (IRCCLK)
0
x
0
0
1
1
1
Satic (OSCCLK)
0
x
0
0
0
1
1
Static (IRCCLK)
0
x
0
0
0
1
0
Static (IRCCLK)
0
x
0
0
0
0
0
Static (IRCCLK)
Содержание MC9S12ZVM series
Страница 116: ...Chapter 2 Port Integration Module S12ZVMPIMV1 MC9S12ZVM Family Reference Manual Rev 1 3 116 Freescale Semiconductor ...
Страница 242: ...Chapter 7 ECC Generation Module SRAM_ECCV1 MC9S12ZVM Family Reference Manual Rev 1 3 242 Freescale Semiconductor ...
Страница 384: ...Chapter 10 Supply Voltage Sensor BATSV3 MC9S12ZVM Family Reference Manual Rev 1 3 384 Freescale Semiconductor ...
Страница 484: ...Chapter 13 Programmable Trigger Unit PTUV2 MC9S12ZVM Family Reference Manual Rev 1 3 484 Freescale Semiconductor ...
Страница 662: ...Chapter 17 Gate Drive Unit GDUV4 MC9S12ZVM Family Reference Manual Rev 1 3 662 Freescale Semiconductor ...
Страница 684: ...Chapter 18 LIN Physical Layer S12LINPHYV2 MC9S12ZVM Family Reference Manual Rev 1 3 684 Freescale Semiconductor ...
Страница 740: ...Chapter 19 128 KB Flash Module S12ZFTMRZ128K512V2 MC9S12ZVM Family Reference Manual Rev 1 3 740 Freescale Semiconductor ...
Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...