mc68hc908kx8 Freescale Semiconductor, Inc, mc68hc908kx8 Datasheet - Page 148

• Manufacturer Part Number: mc68hc908kx8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
13.7 SIM Registers
The SIM has four memory mapped registers described here.
13.7.1 SIM Reset Status Register
This register contains five bits 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.
POR — Power-On Reset Bit
COP — Computer Operating Properly Reset Bit
ILOP — Illegal Opcode Reset Bit
ILAD — Illegal Address Reset Bit (opcode fetches only)
MENRST — Forced Monitor Mode Entry Reset Bit
LVI — Low-Voltage Inhibit Reset Bit
148
1. SIM reset status register (SRSR)
2. Interrupt status register 1 (INT1)
3. Interrupt status register 2 (INT2)
4. Interrupt status register 2 (INT3)
1 = Last reset caused by POR circuit
0 = 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 MENRST circuit
0 = POR or read of SRSR
1 = Last reset was caused by the LVI circuit
0 = POR or read of SRSR
Address:
Read:
Write:
POR:
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
$FE01
POR
Bit 7
1
Figure 13-16. SIM Reset Status Register (SRSR)
= Unimplemented
6
0
0
COP
5
0
ILOP
4
0
ILAD
3
0
MENRST
2
0
LVI
1
0
Freescale Semiconductor
Bit 0
0
0