Freescale Semiconductor, Inc.
Monitor ROM (MON)
Functional Description
Table 13-8. RUN (Run User Program) Command
Description
Operand
Executes RTI instruction
None
None
$28
Data Returned
Opcode
Command Sequence
SENT TO
MONITOR
RUN
RUN
ECHO
13.4.6 Baud Rate
With a 4.9152-MHz crystal and the PTC3 pin at logic 1 during reset, data
is transferred between the monitor and host at 4800 baud. If the PTC3
pin is at logic 0 during reset, the monitor baud rate is 9600. When the
CGM output, CGMOUT, is driven by the PLL, the baud rate is
determined by the MUL[7:4] bits in the PLL programming register (PPG).
See Section 10. Clock Generator Module (CGM).
Table 13-9. Monitor Baud Rate Selection
VCO Frequency Multiplier (N)
Monitor
Baud Rate
1
2
3
4
5
6
4.9152 MHz
4.194 MHz
4800
4096
9600
8192
14,400
12,288
19,200
16,384
24,000
20,480
28,800
24,576
13.4.7 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.
MC68HC908AS60 — Rev. 1.0
Technical Data
Monitor ROM (MON)
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