DEMO9S08EL32AUTO Freescale Semiconductor, DEMO9S08EL32AUTO Datasheet - Page 71
![DEMO BOARD EL32 AUTO](/photos/37/58/375858/demo9s08sg32bd_sml.jpg)
DEMO9S08EL32AUTO
Manufacturer Part Number
DEMO9S08EL32AUTO
Description
DEMO BOARD EL32 AUTO
Manufacturer
Freescale Semiconductor
Type
MCUr
Datasheets
1.DEMO9S08EL32.pdf
(356 pages)
2.DEMO9S08EL32.pdf
(14 pages)
3.DEMO9S08EL32.pdf
(2 pages)
Specifications of DEMO9S08EL32AUTO
Contents
Board, Cable, CD and Documentation
Processor To Be Evaluated
MC9S08EL32
Data Bus Width
8 bit
Interface Type
RS-232, USB
Operating Supply Voltage
12 V
For Use With/related Products
MC9S08EL32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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1
5.7.1
This high page register includes read-only status flags to indicate the source of the most recent reset. When
a debug host forces reset by writing 1 to BDFR in the SBDFR register, none of the status bits in SRS will
be set. Writing any value to this register address causes a COP reset when the COP is enabled except the
values 0x55 and 0xAA. Writing a 0x55-0xAA sequence to this address clears the COP watchdog timer
without affecting the contents of this register. The reset state of these bits depends on what caused the
MCU to reset.
Any other
Freescale Semiconductor
Any of these reset sources that are active at the time of reset entry will cause the corresponding bit(s) to be set; bits
corresponding to sources that are not active at the time of reset entry will be cleared.
reset:
POR:
LVD:
Field
ILOP
POR
COP
PIN
7
6
5
4
W
R
System Reset Status Register (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 (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.
External Reset Pin — Reset was caused by an active-low level on the external reset pin.
0 Reset not caused by external reset pin.
1 Reset came from external reset pin.
Computer Operating Properly (COP) Watchdog — Reset was caused by the COP watchdog timer timing out.
This reset source can be blocked by COPE = 0.
0 Reset not caused by COP timeout.
1 Reset caused by COP timeout.
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.
0 Reset not caused by an illegal opcode.
1 Reset caused by an illegal opcode.
1
0
0
7
Note
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
PIN
0
0
6
(1)
Writing 0x55, 0xAA to SRS address clears COP watchdog timer.
Table 5-3. SRS Register Field Descriptions
Figure 5-2. System Reset Status (SRS)
Note
COP
0
0
5
(1)
Note
ILOP
0
0
4
(1)
Description
Chapter 5 Resets, Interrupts, and General System Control
Note
ILAD
3
0
0
(1)
0
0
0
2
0
LVD
1
1
0
1
0
0
0
0
0
71
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