s908gr16ag4cfj Freescale Semiconductor, Inc, s908gr16ag4cfj Datasheet - Page 245

• Manufacturer Part Number: s908gr16ag4cfj
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

The MCU executes the SWI and PSHH instructions when it enters monitor mode. The RUN command
tells the MCU to execute the PULH and RTI instructions. Before sending the RUN command, the host can
modify the stacked CPU registers to prepare to run the host program. The READSP command returns
the incremented stack pointer value, SP + 1. The high and low bytes of the program counter are at
addresses SP + 5 and SP + 6.
Freescale Semiconductor
Data Returned
Data Returned
Description
Description
Operand
Operand
Opcode
Opcode
Table 19-7. READSP (Read Stack Pointer) Command
Figure 19-16. Stack Pointer at Monitor Mode Entry
Table 19-8. RUN (Run User Program) Command
Reads stack pointer
None
Returns incremented stack pointer value (SP + 1) in high-byte:low-byte order
$0C
Executes PULH and RTI instructions
None
None
$28
ECHO
FROM HOST
READSP
MC68HC908GR16A Data Sheet, Rev. 1.0
HIGH BYTE OF PROGRAM COUNTER
LOW BYTE OF PROGRAM COUNTER
READSP
HIGH BYTE OF INDEX REGISTER
LOW BYTE OF INDEX REGISTER
CONDITION CODE REGISTER
ECHO
FROM HOST
Command Sequence
Command Sequence
RUN
ACCUMULATOR
RUN
HIGH
SP
SP
SP + 1
SP + 2
SP + 3
SP + 4
SP + 5
SP + 6
SP + 7
LOW
SP
RETURN
Monitor Module (MON)
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