MC9S08RG60 Datasheet, PDF (66/232 Pages) Motorola, Inc – Microcontrollers

Resets, Interrupts, and System Configuration
Bit 7
6
5
4
3
2
Read: POR
PIN
COP
ILOP ILAD⁽¹⁾
0
1
Bit 0
LVD
0
Write:
Writing any value to SRS address clears COP watchdog timer.
Power-on reset: 1
0
0
0
0
0
1
0
Low-voltage reset: U
0
0
0
0
0
1
0
Any other reset: 0
(2)
(2)
(2)
(2)
0
0
0
U = Unaffected by reset
NOTES:
1. The ILAD bit is only present in 16K and 8K versions of the devices.
2. Any of these reset sources that are active at the time of reset will cause the corresponding bit(s) to be set;
bits corresponding to sources that are not active at the time of reset will be cleared.
Figure 5-3 System Reset Status (SRS)
POR — Power-On Reset
Reset was caused by the power-on detection logic. Because the internal supply voltage was ramping
up at the time, the low-voltage reset (LVR) status bit is also set to indicate that the reset occurred while
the internal supply was below the LVR threshold.
1 = POR caused reset.
0 = Reset not caused by POR.
PIN — External Reset Pin
Reset was caused by an active-low level on the external reset pin.
1 = Reset came from external reset pin.
0 = Reset not caused by external reset pin.
COP — Computer Operating Properly (COP) Watchdog
Reset was caused by the COP watchdog timer timing out. This reset source may be blocked by
COPE = 0.
1 = Reset caused by COP timeout.
0 = Reset not caused by COP timeout.
ILOP — Illegal Opcode
Reset was caused by an attempt to execute an unimplemented or illegal opcode. The STOP 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.
1 = Reset caused by an illegal opcode.
0 = Reset not caused by an illegal opcode.
ILAD — Illegal Address Access
Reset was caused by an attempt to access a designated illegal address.
1 = Reset caused by an illegal address access
0 = Reset not caused by an illegal address access
66
MC9S08RC/RD/RE/RG
Freescale Semiconductor