mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 108

• Manufacturer Part Number: mc68hc908mr8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
7.7.4 SIM Reset Status Register
Technical Data
108
The SIM reset status register (SRSR) contains six flags that show the
source of the last reset. Clear the SRSR by reading it. A power-on reset
sets the POR bit and clears all other bits in the register.
Reset:
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
dress:
Read:
Write:
Ad-
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
POR
BIt 7
R
R
1
Figure 7-16. 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
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
R
2
0
0
LVI
R
1
0
Bit 0
R
0
0