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MC68HC908EY16 MC68HC908EY8 Data Sheet, Rev. 10
238
Freescale Semiconductor
A sequence of IREAD or IWRITE commands can access a block of memory sequentially over the full
64-Kbyte memory map.
Table 19-6. 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
Table 19-8. RUN (Run User Program) Command
Description
Executes PULH and RTI instructions
Operand
None
Data Returned
None
Opcode
$28
Command Sequence
IWRITE
ECHO
DATA
FROM HOST
READSP
ECHO
FROM HOST
SP
RETURN
SP
HIGH
LOW
RUN
ECHO
FROM HOST