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MC68HC08AS32 Datasheet, PDF (199/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs) | |||
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13.7.2 SIM Reset Status Register
This register contains six flags that show the source of the last reset. The status
register will clear automatically after reading it. A power-on reset sets the POR bit
and clears all other bits in the register.
Address: $FE01
Bit 7
6
5
4
3
2
Read: POR
PIN
COP
ILOP
ILAD
0
Write: R
R
R
R
R
R
Reset:
1
0
0
0
0
0
R
= Reserved
1
Bit 0
LVI
0
R
R
0
0
Figure 13-19. SIM Reset Status Register (SRSR)
POR â Power-On Reset Bit
1 = Last reset caused by POR circuit
0 = Read of SRSR
PIN â External Reset Bit
1 = Last reset caused by external reset pin (RST)
0 = POR or read of SRSR
COP â Computer Operating Properly Reset Bit
1 = Last reset caused by COP counter
0 = POR or read of SRSR
ILOP â Illegal Opcode Reset Bit
1 = Last reset caused by an illegal opcode
0 = POR or read of SRSR
ILAD â Illegal Address Reset Bit (opcode fetches only)
1 = Last reset caused by an opcode fetch from an illegal address
0 = POR or read of SRSR
LVI â Low-Voltage Inhibit Reset Bit
1 = Last reset was caused by the LVI circuit
0 = POR or read of SRSR
MC68HC08AS32 â Rev. 4.1
Freescale Semiconductor
Data Sheet
199
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