mc68hc908rk2 Freescale Semiconductor, Inc, mc68hc908rk2 Datasheet - Page 158

• Manufacturer Part Number: mc68hc908rk2
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

Monitor Read-Only Memory (MON)
10.4.6 Baud Rate
10.4.7 Security
Advance Information
158
Description
Operand
Data Returned
Opcode
Command Sequence
NOTE:
NOTE:
None
None
$28
Executes RTI instruction
Table 10-8. RUN (Run User Program) Command
With a 9.8304-MHz crystal, data is transferred between the monitor and
host at 9600 baud. If a 14.7456-MHz crystal is used, the monitor baud
rate is 14400.
While in monitor mode with V
always driven from the external clock.
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 consecutive 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
$00, the unprogrammed state of the 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.
Note 1 = Echo delay (2 bit times)
SENT TO
MONITOR
Monitor Read-Only Memory (MON)
ECHO
RUN
1
HI
RUN
applied to IRQ1, the MCU bus clock is
MC68HC908RK2
MOTOROLA
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Rev. 4.0