System Background Debug Force Reset Register (Sbdfr) - ROHS MC9S08QE128 Reference Manual

Chapter 5 Resets, Interrupts, and General System Control
Field
7 Power-On Reset — Reset was caused by the power-on detection logic. Because the internal supply voltage was
POR ramping up at the time, the low-voltage reset (LVD) status bit is also set to indicate that the reset occurred while
the internal supply was below the LVD threshold.
0 Reset not caused by POR.
1 POR caused reset.
6 External Reset Pin — Reset was caused by an active-low level on the external reset pin.
PIN 0 Reset not caused by external reset pin.
1 Reset came from external reset pin.
5 Computer Operating Properly (COP) Watchdog — Reset was caused by the COP watchdog timer timing out.
COP This reset source can be blocked by COPE = 0.
0 Reset not caused by COP timeout.
1 Reset caused by COP timeout.
4 Illegal Opcode — Reset was caused by an attempt to execute an unimplemented or illegal opcode. The STOP
ILOP instruction is considered illegal if stop is disabled by STOPE = 0 in the SOPT register. The BGND instruction is
considered illegal if active background mode is disabled by ENBDM = 0 in the BDCSC register.
0 Reset not caused by an illegal opcode.
1 Reset caused by an illegal opcode.
1 Low Voltage Detect — If the LVDRE bit is set and the supply drops below the LVD trip voltage, an LVD reset will
LVD occur. This bit is also set by POR.
0 Reset not caused by LVD trip or POR.
1 Reset caused by LVD trip or POR.
5.8.3

System Background Debug Force Reset Register (SBDFR)

This high page register contains a single write-only control bit. A serial background command such as
WRITE_BYTE must be used to write to SBDFR. Attempts to write this register from a user program are
ignored. Reads always return 0x00.
7
R 0
W
Reset: 0
= Unimplemented or Reserved
1
BDFR is writable only through serial background debug commands, not from user programs.
Figure 5-4. System Background Debug Force Reset Register (SBDFR)
100
Table 5-4. SRS Register Field Descriptions
6 5
0 0
0 0
MC9S08QE128 MCU Series Reference Manual, Rev. 2
Description
4 3
0 0
0 0
2 1
0 0
BDFR
0 0
Freescale Semiconductor
0
0
1
0