EB632 datasheet(90/112 Pages) FREESCALE

90 / 112 page

Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2

Freescale Semiconductor

Bootloader Program

; check if the finished bit (HF4)is set ,if it is set clear it

; and the sticky bit .( it means there was an error and

; the blocks are being loaded for the second time

move.w HCR,d6

bmtsts.w #$8000,d6.l

jf continue_loading_8

move.w HCR,d6

and #$6fff,d6.l

move.w d6,HCR

continue_loading_8

eor d5,d7

;checksum is calculated

on size

move.l d5,d6

;if (size == 0) it means the last block was loaded

;so goto end_of_loading

tsteq

end_of_loading

;load the address

jsr load_from_fifo

move.l d5,r3

eor d5,d7 ;checksum is calculated on address

load_loop_8

;load data word

jsr load_from_fifo

move.l d5,(r3)

;add 4 bytes to the address

adda #$4,r3

;CALCULATE_CHECKSUM d7 = d7 ^ d5

eor d5,d7

;subtract 2 words from the size

sub #$2,d6

;if ( size | = 0) go to load_loop_8

tsteq

load_loop_8

;get the checksum into d7.l

;d2 = (0xffff0000 & d7)>>16

extractu #16,#16,d7,d2

;d2 = d2 & 0x0000ffff

and #$0000ffff,d2,d2

;d7 = d7 & 0x0000ffff

and #$0000ffff,d7,d7

;d7 = d7 ^ d2

eor d2,d7

;d2 = (~d7 & 0x0000ffff) = ~checksum

not d7,d2

and #$0000ffff,d2,d2

;load the checksum ,~checksum

jsr load_from_fifo

;get ~checksum into d4

extractu #16,#16,d5,d4

;delete the ~checksum from d4

EB632 Datasheet(PDF) 90 Page - Freescale Semiconductor, Inc

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