mc68hc908qf4 Freescale Semiconductor, Inc, mc68hc908qf4 Datasheet - Page 135

• Manufacturer Part Number: mc68hc908qf4
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

14.8 SIM Registers
14.8.1 SIM Reset Status Register
MC68HC908QF4 — Rev. 1.0
MOTOROLA
The SIM has three memory mapped registers.
these registers.
This register contains seven 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 (illegal attempt to fetch an opcode from an
unimplemented address)
Address: $FE01
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
POR:
Freescale Semiconductor, Inc.
For More Information On This Product,
POR
Bit 7
1
Address
Figure 14-20. SIM Reset Status Register (SRSR)
System Integration Module (SIM)
$FE00
$FE01
$FE03
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= Unimplemented
PIN
6
0
Table 14-4. SIM Registers
COP
5
0
Register
SRSR
BFCR
BSR
ILOP
4
0
Table 14-4
ILAD
3
0
System Integration Module (SIM)
Access Mode
User
User
User
MODRST
shows the mapping of
2
0
LVI
1
0
SIM Registers
Data Sheet
Bit 0
0
0
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