S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V8)
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
131
4.3.2.9
S12CPMU_UHV_V8 COP Control Register (CPMUCOP)
This register controls the COP (Computer Operating Properly) watchdog.
The clock source for the COP is either ACLK, IRCCLK or OSCCLK depending on the setting of the
COPOSCSEL0 and COPOSCSEL1 bit (see also
).
In Stop Mode with PSTP=1 (Pseudo Stop Mode), COPOSCSEL0=1 and COPOSCEL1=0 and PCE=1 the
COP continues to run, else the COP counter halts in Stop Mode with COPOSCSEL1 =0.
In Full Stop Mode and Pseudo Stop Mode with COPOSCSEL1=1 the COP continues to run.
Read: Anytime
Write:
1. RSBCK: Anytime in Special Mode; write to “1” but not to “0” in Normal Mode
2. WCOP, CR2, CR1, CR0:
— Anytime in Special Mode, when WRTMASK is 0, otherwise it has no effect
— Write once in Normal Mode, when WRTMASK is 0, otherwise it has no effect.
– Writing CR[2:0] to “000” has no effect, but counts for the “write once” condition.
– Writing WCOP to “0” has no effect, but counts for the “write once” condition.
When a non-zero value is loaded from Flash to CR[2:0] the COP time-out period is started.
A change of the COPOSCSEL0 or COPOSCSEL1 bit (writing a different value) or loosing UPOSC status
while COPOSCSEL1 is clear and COPOSCSEL0 is set, re-starts the COP time-out period.
In Normal Mode the COP time-out period is restarted if either of these conditions is true:
1. Writing a non-zero value to CR[2:0] (anytime in special mode, once in normal mode) with
WRTMASK = 0.
2. Writing WCOP bit (anytime in Special Mode, once in Normal Mode) with WRTMASK = 0.
3. Changing RSBCK bit from “0” to “1”.
In Special Mode, any write access to CPMUCOP register restarts the COP time-out period.
0x003C
7
6
5
4
3
2
1
0
R
WCOP
RSBCK
0
0
0
CR2
CR1
CR0
W
WRTMASK
Reset
F
0
0
0
0
F
F
F
After de-assert of System Reset the values are automatically loaded from the Flash memory. See Device specification for
details.
= Unimplemented or Reserved
Figure 4-12. S12CPMU_UHV_V8 COP Control Register (CPMUCOP)
Содержание MC9S12VRP64
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