MC68HC912BD32CFU10 FREESCALE [Freescale Semiconductor, Inc], MC68HC912BD32CFU10 Datasheet - Page 244

• Manufacturer Part Number: MC68HC912BD32CFU10
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Enabling the BDM
lockout
Disabling the BDM
lockout
BDM Registers
Development Support
MC68HC912BD32 Rev 1.0
Enabling the BDM lockout feature is only possible in special modes
(SMODN=0) and is accomplished by the following steps.
Disabling the BDM lockout is only possible in special modes
(SMODN=0). Follow the same steps as for enabling the BDM lockout,
but erase the SHADOW byte.
At the next reset, the SHADOW byte is loaded into the EEMCR register.
NOBDML bit in EEMCR will be set and BDM becomes operational.
Seven BDM registers are mapped into the standard 64-Kbyte address
space when BDM is active. Mapping is shown in
1. Remove the SHADOW byte protection by clearing SHPROT bit in
2. Clear NOSHB bit in EEMCR register to make the SHADOW byte
3. Program bit 7 of the SHADOW byte like a regular EEPROM
4. Protect the SHADOW byte by setting SHPROT bit in EEPROT
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EEPROT register.
visible at $0FC0.
location at address $0FC0 (write $7F into address $0FC0). Do not
program other bits of the SHADOW byte (location $0FC0);
otherwise some regular EEPROM array locations will not be
visible. At the next reset, the SHADOW byte is loaded into the
EEMCR register. NOBDML bit in EEMCR will be cleared and BDM
will not be operational.
register.
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$FF02 – $FF03
$FF04 – $FF05
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Address
$FF00
$FF01
$FF06
Table 58 BDM registers
BDM CCR Holding Register
BDM Instruction Register
BDM Address Register
BDM Status Register
BDM Shift Register
Register
Table
58.
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