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FIELD UPDATES FOR FLASH BASED ST7 APPLICATIONS USING A PC COMM PORT

segment byte at: FDFC 'program'

; skip jump from BANK0

jp

start

;*************** SECTOR0 CODE ***********************************

segment byte at: 80-FF 'bank0ram0'

b0byte0:

ds.b 1

bytecount:

ds.b 1

loadaddress:

ds.w 1

checksum:

ds.b 1

flashbuffer:

ds.b 32

RAMCODE:

ds.b 40

segment byte at: FE00 'program'

BANK0:

NOP

NOP

sim

; GLOBALLY DISABLE INTERRUPTS

ld a,#%11010010

; set baud rate to 9600

ld SCIBRR,a

ld a,#%00001100

; enable SCI transmitter and receiver

ld SCICR2,a

; copy the loader routine from ROM to RAM

clr x

ramtransfer:

ld a,(FLASHPROGRAMMER,x)

ld (RAMCODE,x),a

inc x

cp x,#40

jrne ramtransfer

bootupwait:

ld x,#55

; 5 seconds

clr y

clr a