CMOSTEK CMT2380F17 Manual page 302

Figure 28-5. Demo Code for ISP/IAP Byte Program
MOV ISPCR, #10000011b
MOV IFMT, #02h
MOV IFADRH, ??
MOV IFADRL, ??
MOV IFD, ??
MOV SCMD, #46h
MOV SCMD, #0B9h
; Now, MCU will halt here until processing completed
MOV IFMT, #00h
MOV ISPCR, #00000000b
; ISPCR.7=1, enable ISP
; select Program Mode
; fill [IFADRH,IFADRL] with byte addres
;
; fill IFD with the data to be programmed
; trigger ISP/IAP processing
;
; select Standby Mode
; ISPCR.7 = 0, disable ISP
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CMT2380F17
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