MC68HC908AZ60 Datasheet, PDF (179/480 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Monitor ROM (MON)
Functional Description
Table 10
Baud rate
Closest PC baud PC
Error %
Clock freq PTC3=0 PTC3=1 PTC3=0 PTC3=1 PTC3=0 PTC3=1
32kHz
57.97
28.98
57.6
28.8
0.64
0.63
1MHz
1811.59 905.80
1800
900
0.64
0.64
2MHz
3623.19 1811.59 3600
1800
0.64
0.64
4MHz
7246.37 3623.19 7200
3600
0.64
0.64
4.194MHz 7597.83 3798.91 7680
3840
1.08
1.08
4.9152MHz 8904.35 4452.17 8861
4430
0.49
0.50
8MHz 14492.72 7246.37 14400
7200
0.64
0.64
16MHz 28985.51 14492.75 28800 14400
0.64
0.64
Care should be taken when setting the baud rate since incorrect
baud rate setting can result in communications failure.
Security
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.
NOTE:
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
$00, 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.
11-mon
MOTOROLA
Monitor ROM (MON)
MC68HC908AZ60 — Rev 2.0
177