mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 107

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

7.7.2 SIM Reset Status Register
MC68HC908MR24 — Rev. 4.1
Freescale Semiconductor
Address:
The SIM reset status register (SRSR) contains six flags that show the
source of the last reset. Clear the SIM reset status register by reading it.
A power-on reset sets the POR bit and clears all other bits in the
register.
POR — Power-On Reset Bit
PIN — External Reset Bit
COP — Computer Operating Properly Reset Bit
ILOP — Illegal Opcode Reset Bit
ILAD — Illegal Address Reset Bit (opcode fetches only)
LVI — Low-Voltage Inhibit Reset Bit
Reset:
Read:
Write:
1 = Last reset caused by POR circuit
0 = Read of SRSR
1 = Last reset caused by external reset pin (RST)
0 = POR or read of SRSR
1 = Last reset caused by COP counter
0 = POR or read of SRSR
1 = Last reset caused by an illegal opcode
0 = POR or read of SRSR
1 = Last reset caused by an opcode fetch from an illegal address
0 = POR or read of SRSR
1 = Last reset was caused by the LVI circuit
0 = POR or read of SRSR
$FE01
BIt 7
POR
R
R
1
Figure 7-14. SIM Reset Status Register (SRSR)
System Integration Module (SIM)
= Reserved
PIN
R
6
0
COP
R
5
0
ILOP
R
4
0
ILAD
R
3
0
System Integration Module (SIM)
R
2
0
0
Advance Information
LVI
R
1
0
Bit 0
R
0
0
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