MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 168
MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68HC908AB32CFU
Manufacturer:
MOTOROLA
Quantity:
1 372
Company:
Part Number:
MC68HC908AB32CFU
Manufacturer:
MC
Quantity:
852
Company:
Part Number:
MC68HC908AB32CFU
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
MC68HC908AB32CFU
Manufacturer:
FRE/MOT
Quantity:
20 000
Company:
Part Number:
MC68HC908AB32CFUE
Manufacturer:
ATMEL
Quantity:
1 001
Company:
Part Number:
MC68HC908AB32CFUE
Manufacturer:
FREE
Quantity:
6
Company:
Part Number:
MC68HC908AB32MPB
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
- Current page: 168 of 392
- Download datasheet (5Mb)
Monitor ROM (MON)
10.6 Extended Security
Technical Data
168
NOTE:
NOTE:
Upon power-on reset, if the received bytes of the security code do not
match the data at locations $FFF6–$FFFD, the host fails to bypass the
security feature. The MCU remains in monitor mode, but reading a
FLASH location returns an invalid value and trying to execute code from
FLASH causes an illegal address reset. After receiving the eight security
bytes from the host, the MCU transmits a break character, signifying that
it is ready to receive a command.
To determine whether the security code entered is correct, check to see
if bit 6 of RAM address $50 is set. If it is, then the correct security code
has been entered and FLASH can be accessed.
The MCU does not transmit a break character until after the host sends
the eight security bits.
If the host fails the security bypass as described in
MCU remains in monitor mode, but reading a FLASH location returns an
invalid value and trying to execute code from FLASH causes an illegal
address reset. The MCU monitor commands are still valid and user
software can execute from RAM. A bulk-erase operation is possible,
erasing the entire FLASH memory, including the security bytes at
$FFF6–$FFFD.
To further disable monitor mode functions, an extended security
command keyword can be programmed at FLASH locations
$FFC0–$FFC7. The keyword is eight bytes long with a 7-byte ASCII
string and 1-byte $00 delimiter. The keyword for the MC68HC908AB32
MCU is "PSWDOPT" + $00.
Entry to monitor mode with extended security command keyword
programmed, the MCU stops communicating with the host after
transmitting a break character if the host fails the security bypass as
described in
Once the extended security command keyword is programmed, the
FLASH memory cannot be erased without a valid security code
(matching $FFF6–$FFFD). Therefore, the extended security command
keyword should not be programmed during software development.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
10.5
Monitor ROM (MON)
Security.
MC68HC908AB32
10.5
Security, the
MOTOROLA
—
Rev. 1.0
Related parts for MC68HC908AB32
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Motorola, Inc [VOLTAGE REGULATOR]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
6367254 MOTOROLA SC (XSTRS/R F)
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
MC1494LMotorola, Inc [MONOLITHIC FOUR-QUADRANT MULTIPLIER]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
MC1466LMotorola, Inc [PRECISION WIDE RANGE VOLTAGE AND CURRENT REGULATOR]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
MC145532DWMotorola, Inc [ADPCM Transcoder]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
Silicon Controlled Rectifiers
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF Power Field Effect Transistors N-Channel Enhancement-Mode Lateral MOSFETs
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF POWER FIELD EFFECT TRANSISTORS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
LATERAL N-CHANNEL BROADBAND RF POWER MOSFETs
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF POWER FIELD EFFECT TRANSISTOR
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
RF LOW POWER TRANSISTOR NPN SILICON
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
PLASTIC SURFACE MOUNT ZENER DIODES 1.5 WATTS 3.3-68 VOLTS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
OVERVOLTAGE TRANSIENT SUPPRESSOR
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
TMOS POWER FET 15 AMPERES 60 VOLTS
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet:
Part Number:
Description:
TMOS POWER FET LOGIC LEVEL 19 AMPERES 30 VOLTS RDS(on) = 0.099 OHM
Manufacturer:
MOTOROLA [Motorola, Inc]
Datasheet: