Datasheet

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MC68HC908GR16 Data Sheet, Rev. 5.0
250 Freescale Semiconductor
A sequence of IREAD or IWRITE commands can access a block of memory sequentially over the full
64-Kbyte memory map.
Table 19-5. IREAD (Indexed Read) Command
Description Read next 2 bytes in memory from last address accessed
Operand 2-byte address in high byte:low byte order
Data Returned Returns contents of next two addresses
Opcode $1A
Command Sequence
Table 19-6. IWRITE (Indexed Write) Command
Description Write to last address accessed + 1
Operand Single data byte
Data Returned None
Opcode $19
Command Sequence
Table 19-7. READSP (Read Stack Pointer) Command
Description Reads stack pointer
Operand None
Data Returned Returns incremented stack pointer value (SP + 1) in high-byte:low-byte order
Opcode $0C
Command Sequence
IREAD
IREAD
ECHO
FROM HOST
DATA
RETURN
DATA
IWRITE
IWRITE
ECHO
DATA DATA
FROM HOST
READSP
READSP
ECHO
FROM HOST
SP
RETURN
SP
HIGH LOW