MC68HC908AZ60 Datasheet, PDF (178/480 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Monitor ROM (MON)
Table 8. RUN (Run User Program) Command
Description
Executes RTI instruction
Operand
None
Data Returned None
Opcode
$28
Command Sequence
SENT TO
MONITOR
RUN
RUN
ECHO
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 Clock Generator Module (CGM) on page 127).
Monitor
Baud Rate
4.9152 MHz
4.194 MHz
Table 9. Monitor Baud Rate Selection
1
4800
4096
VCO Frequency Multiplier (N)
2
3
4
5
9600 14,400 19,200 24,000
8192 12,288 16,384 20,480
6
28,800
24,576
Later revisions feature a monitor mode which is optimised to operate
with either a 4.1952MHz crystal clock source (or multiples of
4.1952MHz) or a 4MHz crystal (or multiples of 4MHz). This supports
designs which use the MSCAN module, which is generally clocked from
a 4MHz, 8MHz or 16MHz crystal. The table below outlines the available
baud rates for a range of crystals and how they can match to a PC baud
rate.
MC68HC908AZ60 — Rev 2.0
176
Monitor ROM (MON)
10-mon
MOTOROLA