mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 179

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

5.3.2.1
Register Global Address 0x3_FF01
1
2
Read: All modes through BDM operation when not secured
Write: All modes through BDM operation when not secured, but subject to the following:
Freescale Semiconductor
Special Single-Chip Mode
0x3_FF0A
0x3_FF0B
0x3_FF08
0x3_FF09
Address
ENBDM is read as 1 by a debugging environment in special single chip mode when the device is not secured or secured but
fully erased (Flash). This is because the ENBDM bit is set by the standard BDM firmware before a BDM command can be fully
transmitted and executed.
UNSEC is read as 1 by a debugging environment in special single chip mode when the device is secured and fully erased,
else it is 0 and can only be read if not secure (see also bit description).
Global
— ENBDM should only be set via a BDM hardware command if the BDM firmware commands
— BDMACT can only be set by BDM hardware upon entry into BDM. It can only be cleared by
All Other Modes
are needed. (This does not apply in special single chip mode).
the standard BDM firmware lookup table upon exit from BDM active mode.
BDMPPR
Reserved
Reserved
Reserved
Register
BDM Status Register (BDMSTS)
Name
Reset
W
R
W
W
W
W
R
R
R
R
ENBDM
0
BPAE
0
0
7
Bit 7
1
Figure 5-2. BDM Register Summary (continued)
X
0
0
0
Figure 5-3. BDM Status Register (BDMSTS)
MC9S12VR Family Reference Manual, Rev. 2.2
Preliminary - Subject to Change Without Notice
= Unimplemented, Reserved
= Always read zero
BDMACT
= Unimplemented, Reserved
= Indeterminate
1
0
6
6
0
0
0
0
0
0
0
5
5
0
0
0
0
SDV
0
0
4
4
0
0
0
0
TRACE
BPP3
0
0
3
3
0
0
0
0
Background Debug Module (S12SBDMV1)
= Implemented (do not alter)
= Implemented (do not alter)
= Always read zero
BPP2
0
0
0
2
2
0
0
0
UNSEC
BPP1
0
1
0
1
0
0
0
2
BPP0
Bit 0
0
0
0
0
0
0
0
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