mc9s08sg4 Freescale Semiconductor, Inc, mc9s08sg4 Datasheet - Page 67
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mc9s08sg4
Manufacturer Part Number
mc9s08sg4
Description
8-bit Microcontroller Family
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08SG4.pdf
(320 pages)
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1
5.7.2
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.
Freescale Semiconductor
BDFR is writable only through serial background debug commands, not from user programs.
Reset:
BDFR
Field
Field
ILAD
LVD
3
1
0
W
R
System Background Debug Force Reset Register (SBDFR)
Illegal Address — Reset was caused by an attempt to access either data or an instruction at an unimplemented
memory address.
0 Reset not caused by an illegal address
1 Reset caused by an illegal address
Low Voltage Detect — If the LVDRE bit is set and the supply drops below the LVD trip voltage, an LVD reset will
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.
Background Debug Force Reset — A serial background command such as WRITE_BYTE can be used to allow
an external debug host to force a target system reset. Writing 1 to this bit forces an MCU reset. This bit cannot
be written from a user program.
0
0
7
Figure 5-3. System Background Debug Force Reset Register (SBDFR)
= Unimplemented or Reserved
0
0
6
Table 5-4. SBDFR Register Field Descriptions
Table 5-3. SRS Register Field Descriptions
MC9S08SG8 MCU Series Data Sheet, Rev. 3
0
0
5
0
0
4
Description
Description
Chapter 5 Resets, Interrupts, and General System Control
3
0
0
0
0
2
0
0
1
BDFR
0
0
0
1
67
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