mc68hc05pv8 Freescale Semiconductor, Inc, mc68hc05pv8 Datasheet - Page 78

• Manufacturer Part Number: mc68hc05pv8
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

T echnical Data
5.3 Reset status register (RSR)
Technical Data
This register contains eight flags that show the source of the last reset.
A power-on reset sets the POR bit in the system control register and
clears all other bits in the reset status register. All bits can be cleared by
writing a one to the corresponding bit. Uncleared bits remain set as long
as they are not cleared by a power-on reset or by software.
PINR – External Reset Bit
STOPR – Illegal STOP Instruction Reset Bit
COPR – COP (Computer Operating Properly) Reset Bit
ILINR – Illegal Instruction Reset Bit
CMR – Clock Monitor Reset Bit
$002A
Read:
Write:
POR:
Indicates the last reset was caused by a disabled STOP instruction.
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1 = Last reset caused by external reset pin (RESET)
0 = No pin reset since PINR was cleared by software or POR
1 = Last reset caused by a disabled STOP instruction
0 = No illegal STOP instruction since STOPR was cleared by
1 = Last reset caused by COP
0 = No COP reset since COPR was cleared by software or POR
1 = Last reset caused by an instruction fetch from an illegal address
0 = No illegal instruction fetch reset since ILINR was cleared by
1 = Last reset caused by the clock monitor due to a failure on
0 = No clock monitor reset since CMR was cleared by software or
PINR
Bit 7
software or POR
software or POR
system clock or system clock is back. Refer to RCON status bit
in the interrupt status register
POR
0
Figure 5-1 Reset Status Register (RSR)
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STOPR
6
0
Resets
COPR
5
0
ILINR
4
0
CMR
3
0
MC68HC(8)05PV8/A — Rev. 1.9
HTR
2
0
HVR
1
0
Bit 0
LVR
0