Datasheet

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MC68HC908QB8 Data Sheet, Rev. 3
204 Freescale Semiconductor
A sequence of IREAD or IWRITE commands can access a block of memory sequentially over the full
64-Kbyte memory map.
Table 17-4. WRITE (Write Memory) Command
Description Write byte to memory
Operand 2-byte address in high-byte:low-byte order; low byte followed by data byte
Data Returned None
Opcode $49
Command Sequence
Table 17-5. IREAD (Indexed Read) Command
Description Read next 2 bytes in memory from last address accessed
Operand None
Data Returned Returns contents of next two addresses
Opcode $1A
Command Sequence
Table 17-6. IWRITE (Indexed Write) Command
Description Write to last address accessed + 1
Operand Single data byte
Data Returned None
Opcode $19
Command Sequence
WRITE
WRITE
ECHO
FROM HOST
ADDRESS
HIGH
ADDRESS
HIGH
ADDRESS
LOW
ADDRESS
LOW
DATA DATA
IREAD
IREAD
ECHO
DATA
RETURN
DATA
FROM HOST
IWRITEIWRITE
ECHO
FROM HOST
DATA DATA