MC68HC912B32MFU8 MOTOROLA [Motorola, Inc], MC68HC912B32MFU8 Datasheet - Page 122

• Manufacturer Part Number: MC68HC912B32MFU8
• Description: 16-Bit Microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

STATUS — BDM Status Register
ENBDM — Enable BDM (permit active background debug mode)
BDMACT — Background Mode Active Status
ENTAG — Instruction Tagging Enable
SDV — Shifter Data Valid
TRACE — Asserted by the TRACE1 instruction
SHIFTER — BDM Shift Register
ADDRESS — BDM Address Register
CCRSAV — BDM CCR Holding Register
122
MOTOROLA
RESET:
This register can be read or written by BDM commands or firmware.
Set by the TAGGO instruction and cleared when BDM is entered.
Shows that valid data is in the serial interface shift register. Used by firmware-based instructions.
This 16-bit register contains data being received or transmitted via the serial interface.
This 16-bit register is temporary storage for BDM hardware and firmware commands.
This register preserves the content of the CPU12 CCR while BDM is active.
0 = BDM cannot be made active (hardware commands still allowed)
1 = BDM can be made active to allow firmware commands
0 = BDM not active
1 = BDM active and waiting for serial commands
0 = Tagging not enabled, or BDM active
1 = Tagging active (BDM cannot process serial commands while tagging is active.)
0 = No valid data
1 = Valid Data
ENBDM
CCR7
Bit 15
Bit 15
Bit 7
Bit 7
Bit 7
Bit 7
S15
A15
S7
A7
0
BDMACT
CCR6
S14
A14
S6
A6
14
14
6
0
6
6
6
ENTAG
CCR5
S13
A13
S5
A5
13
13
5
0
5
5
5
CCR4
SDV
S12
A12
S4
A4
12
12
4
1
4
4
4
TRACE
CCR3
S11
A11
S3
A3
11
11
3
0
3
3
3
CCR2
S10
A10
S2
A2
10
10
2
0
0
2
2
2
CCR1
S9
S1
A9
A1
1
0
0
9
1
9
1
1
MC68HC912B32TS/D
(BDM) $FF02, $FF03
(BDM) $FF04, $FF05
CCR0
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 0
S8
S0
A8
A0
MC68HC912B32
0
0
(BDM) $FF01
(BDM) $FF06