mc9s08gt16a Freescale Semiconductor, Inc, mc9s08gt16a Datasheet - Page 73
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mc9s08gt16a
Manufacturer Part Number
mc9s08gt16a
Description
Hcs08 Microcontrollers 8-bit Microcontroller Family
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08GT16A.pdf
(300 pages)
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5.7.3
This 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
ICG
3
2
1
0
W
R
System Background Debug Force Reset Register (SBDFR)
Illegal Address — Reset was caused by an attempt to access a designated illegal address.
0 Reset not caused by an illegal address access.
1 Reset caused by an illegal address access.
Illegal address areas in the MC9S08GT16A are:
Unused and reserved locations in register areas are not considered designated illegaladdresses and do not
triggerillegal address resets.
Internal Clock Generation Module Reset — Reset was caused by an ICG module reset.
0 Reset not caused by ICG module.
1 Reset caused by ICG module.
Low Voltage Detect — If the LVD reset is enabled (LVDE = LVDRE = 1) and the supply drops below the LVD trip
voltage, an LVD reset occurs. The LVD function is disabled when the MCU enters stop. To maintain LVD operation
in stop, the LVDSE bit must be set.
0 Reset not caused by LVD trip or POR.
1 Reset caused by LVD trip or POR.
Background Debug Force Reset — A serial background mode command such as WRITE_BYTE allows 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.
• 0x0880 - 0x17FF — Gap from end of RAM to start of high page registers
• 0x182C - 0xBFFF — Gap from end of high page registers to start of Flash memory
0
0
7
Figure 5-4. System Background Debug Force Reset Register (SBDFR)
= Unimplemented or Reserved
0
0
6
Table 5-3. SRS Field Descriptions (continued)
Table 5-4. SBDFR Field Descriptions
MC9S08GT16A/GT8A Data Sheet, Rev. 1
0
0
5
0
0
4
Description
Description
3
0
0
Resets, Interrupts, and System Configuration
0
0
2
0
0
1
Note
BDFR
0
0
0
(1)
73
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