MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 185

• Manufacturer Part Number: MC68HC908AZ32ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

12.4.7 Security
68HC908AZ32A — Rev 0.0
MOTOROLA
NOTE:
Care should be taken when setting the baud rate since incorrect
baud rate setting can result in communications failure.
A security feature discourages unauthorized reading of FLASH locations
while in monitor mode. The host can bypass the security feature at
monitor mode entry by sending eight security bytes that match the bytes
at locations $FFF6–$FFFD. Locations $FFF6–$FFFD contain user-
defined data.
Do not leave locations $FFF6–$FFFD blank. For security reasons,
program locations $FFF6–$FFFD even if they are not used for vectors.
If FLASH is unprogrammed, the eight security byte values to be sent are
$FF, the unprogrammed state of FLASH.
During monitor mode entry, the MCU waits after the power-on reset for
the host to send the eight security bytes on pin PA0.
4.9152MHz
Freescale Semiconductor, Inc.
16MHz
8MHz
For More Information On This Product,
Table 12-9 68HC908AZ32A Monitor Baud Rate Selection
Go to: www.freescale.com
14492.72
28985.51
8904.35
Monitor ROM (MON)
Baud rate
14492.75
4452.17
7246.37
Closest PC baud PC
14400
28800
8861
14400
4430
7200
Functional Description
Monitor ROM (MON)
Advance Information
0.49
0.64
0.64
Error %
0.50
0.64
0.64
185