MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 170

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Chapter 6 Background Debug Module (BDMV4) Block Description
6.3.2.1
Note:
1. ENBDM is read as "1" by a debugging environment in Special single-chip mode when the device is not secured or secured
2. UNSEC is read as "1" by a debugging environment in Special single-chip mode when the device is secured and fully erased,
Read: All modes through BDM operation
Write: All modes but subject to the following:
170
0xFF01
Special single-chip mode:
Special peripheral mode:
but fully erased (Flash and EEPROM).This is because the ENBDM bit is set by the standard firmware before a BDM command
can be fully transmitted and executed.
else it is "0" and can only be read if not secure (see also bit description).
•
•
•
•
BDMACT can only be set by BDM hardware upon entry into BDM. It can only be cleared by the
standard BDM firmware lookup table upon exit from BDM active mode.
CLKSW can only be written via BDM hardware or standard BDM firmware write commands.
All other bits, while writable via BDM hardware or standard BDM firmware write commands,
should only be altered by the BDM hardware or standard firmware lookup table as part of BDM
command execution.
ENBDM should only be set via a BDM hardware command if the BDM firmware commands are
needed. (This does not apply in special single-chip mode).
All other modes:
BDM Status Register (BDMSTS)
Reset:
W
R
ENBDM
1
7
0
0
0
(1)
Figure 6-3. BDM Status Register (BDMSTS)
= Unimplemented or Reserved
BDMACT
1
1
1
0
6
ENTAG
MC9S12Q128
5
0
0
0
0
Rev 1.09
SDV
0
0
0
0
4
TRACE
3
0
0
0
0
= Implemented (do not alter)
CLKSW
0
0
0
0
2
Freescale Semiconductor
UNSEC
0
1
0
0
0
(2)
0
0
0
0
0
0