MC68HC908RK2 Datasheet, PDF (155/232 Pages) Motorola, Inc – Microcontroller Unit

Monitor Read-Only Memory (MON)
Functional Description
10.4.5 Commands
The monitor ROM uses these commands:
• READ, read memory
• WRITE, write memory
• IREAD, indexed read
• IWRITE, indexed write
• READSP, read stack pointer
• RUN, run user program
A sequence of IREAD or IWRITE commands can access a block of
memory sequentially over the full 64-Kbyte memory map.
Table 10-3. READ (Read Memory) Command
Description
Read byte from memory
Operand
Specifies 2-byte address in high byte:low byte order
Data Returned Returns contents of specified address
Opcode
$4A
Command Sequence
SENT TO
MONITOR
ECHO
READ
READ
1
ADDR. HIGH ADDR. HIGH ADDR. LOW ADDR. LOW
3
1
3
1
2
Notes: 1 = Echo delay (2 bit times)
2 = Data return delay (2 bit times)
3 = Wait 1 bit time before sending next byte.
DATA
RESULT
MC68HC908RK2 — Rev. 4.0
MOTOROLA
Monitor Read-Only Memory (MON)
Advance Information
155