参数资料
型号: MC68HC908RK2DW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO20
封装: PLASTIC, SOIC-20
文件页数: 20/158页
文件大小: 1020K
代理商: MC68HC908RK2DW
System Integration Module (SIM)
MC68HC908RK2 Data Sheet, Rev. 5.1
116
Freescale Semiconductor
SBSW — SIM Break Stop/Wait Bit
SBSW can be read within the break state SWI routine. The user can modify the return address on the
stack by subtracting one from it. Writing 0 to the SBSW bit clears it.
1 = Wait mode was exited by break interrupt.
0 = Wait mode was not exited by break interrupt.
10.7.2 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.
POR — Power-On Reset Bit
1 = Last reset caused by POR circuit
0 = Read of SRSR
PIN — External Reset Bit
1 = Last reset caused by external reset pin (RST)
0 = POR or read of SRSR
COP — Computer Operating Properly Reset Bit
1 = Last reset caused by COP counter
0 = POR or read of SRSR
ILOP — Illegal Opcode Reset Bit
1 = Last reset caused by an illegal opcode
0 = POR or read of SRSR
ILAD — 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 — Low-Voltage Inhibit Reset Bit
1 = Last reset was caused by the LVI circuit
0 = POR or read of SRSR
Address:
$FE01
Bit 7
654321
Bit 0
Read:
POR
PIN
COP
ILOP
ILAD
0
LVI
0
Write:
POR:
1
XXXXXXX
= Unimplemented
X = Indeterminate
Figure 10-18. SIM Reset Status Register (SRSR)
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