mc9s08lc60 Freescale Semiconductor, Inc, mc9s08lc60 Datasheet - Page 72
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mc9s08lc60
Manufacturer Part Number
mc9s08lc60
Description
Hcs08 Microcontrollers 8-bit Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08LC60.pdf
(360 pages)
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Any other reset:
Any of these reset sources that are active at the time of reset will cause the corresponding bit(s) to be set; bits corresponding to sources
that are not active at the time of reset will be cleared.
Chapter 5 Resets, Interrupts, and System Configuration
5.8.2
This register includes six read-only status flags to indicate the source of the most recent reset. When a
debug host forces reset by writing 1 to BDFR in the SBDFR register, none of the status bits in SRS will be
set. Writing any value to this register address clears the COP watchdog timer without affecting the contents
of this register. The reset state of these bits depends on what caused the MCU to reset.
72
Field
ILOP
POR
COP
LVD
ICG
PIN
7
6
5
4
2
1
POR:
LVR:
W
R
System Reset Status Register (SRS)
u = Unaffected by reset
Power-On Reset — Reset was caused by the power-on detection logic. Because the internal supply voltage was
ramping up at the time, the low-voltage reset (LVD) status bit is also set to indicate that the reset occurred while
the internal supply was below the LVD threshold.
0 Reset not caused by POR.
1 POR caused reset.
External Reset Pin — Reset was caused by an active-low level on the external reset pin.
0 Reset not caused by external reset pin.
1 Reset came from external reset pin.
Computer Operating Properly (COP) Watchdog — Reset was caused by the COP watchdog timer timing out.
This reset source may be blocked by COPE = 0.
0 Reset not caused by COP timeout.
1 Reset caused by COP timeout.
Illegal Opcode — Reset was caused by an attempt to execute an unimplemented or illegal opcode. The STOP
instruction is considered illegal if stop is disabled by STOPE = 0 in the SOPT register. The BGND instruction is
considered illegal if active background mode is disabled by ENBDM = 0 in the BDCSC register.
0 Reset not caused by an illegal opcode.
1 Reset caused by an illegal opcode.
Internal Clock Generation Module Reset — Reset was caused by an ICG module reset.
0 Reset not caused by ICG module.
1 Reset caused by ICG module.
Low Voltage Detect — If the LVD reset is enabled (LVDE = LVDRE = 1) and the supply drops below the LVD trip
voltage, an LVD reset occurs. The LVD function is disabled when the MCU enters stop. To maintain LVD operation
in stop, the LVDSE bit must be set.
0 Reset not caused by LVD trip or POR.
1 Reset caused by LVD trip or POR.
POR
7
1
u
0
Note
PIN
MC9S08LC60 Series Data Sheet: Technical Data, Rev. 4
0
0
6
(1)
Figure 5-3. System Reset Status (SRS)
Writing any value to SRS address clears COP watchdog timer.
Table 5-4. SRS Field Descriptions
Note
COP
0
0
5
(1)
Note
ILOP
0
0
4
Description
(1)
0
0
0
0
3
Note
ICG
0
0
2
(1)
Freescale Semiconductor
LVD
1
1
1
0
0
0
0
0
0
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