mc908jl16 Freescale Semiconductor, Inc, mc908jl16 Datasheet - Page 189

• Manufacturer Part Number: mc908jl16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

16.3.6 Break Signal
A start bit followed by nine low bits is a break signal. (See Figure 16-13.) When the monitor receives a
break signal, it drives the PTB0 pin high for the duration of two bits before echoing the break signal.
16.3.7 Commands
The monitor ROM uses the following commands:
Freescale Semiconductor
Command Sequence
SENT TO
MONITOR
•
•
•
•
•
•
Data Returned
READ (read memory)
WRITE (write memory)
IREAD (indexed read)
IWRITE (indexed write)
READSP (read stack pointer)
RUN (run user program)
ECHO
Description
Operand
Opcode
READ
Read byte from memory
Specifies 2-byte address in high byte:low byte order
Returns contents of specified address
$4A
0
1
READ
2
Table 16-4. READ (Read Memory) Command
MISSING STOP BIT
3
Figure 16-13. Break Transaction
4
MC68HC908JL16 Data Sheet, Rev. 1.1
ADDR. HIGH
5
6
7
ADDR. HIGH
TWO-STOP-BIT DELAY BEFORE ZERO ECHO
ADDR. LOW
0
1
2
ADDR. LOW
3
4
5
6
RESULT
DATA
Monitor Module (MON)
7
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