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EB632 bảng dữ liệu(PDF) 88 Page - Freescale Semiconductor, Inc

tên linh kiện EB632
Giải thích chi tiết về linh kiện  Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M)
PDF  112 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

EB632 bảng dữ liệu(HTML) 88 Page - Freescale Semiconductor, Inc

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Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2
88
Freescale Semiconductor
Bootloader Program
;move the last 2 words to their address (which is kept in r3)
move.l d4,(r3)
adda #$4,r3
;write checksum , ~checksum at the and of the block
move.l d5,(r3)
;calculate the checksum of these words
eor d4,d7
;calculate ~checksum -> d2
;get the real checksum from d7 and
;get it into d7.l as explained in the beggining of the file
;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 = checksum
eor d2,d7
;d2 = (~d7 & 0x0000ffff) = ~checksum
not d7,d2
and #$0000ffff,d2,d2
;get loaded checksum , ~checksum from d5
;get checksum into d4
extractu #16,#16,d5,d4
and #$0000ffff,d4,d4
;delete the checksum from d5
and #$0000ffff,d5,d5
;if ( ~checksum_loaded |= ~Checksum_calculated ) goto set sticky bit
cmpeq d5,d2
nop
iff jsr set_sticky_bit
;if ( checksum_loaded |= Checksum_calculated ) goto set sticky bit
cmpeq d4,d7
nop
iff jsr set_sticky_bit
;goto loading the next block
;goto load_16bit
load_16bit
;d7 = checksm =0 , clear the calculated checksum register
move.l #0,d7
;load the size and address
jsr load_from_fifo
;move the size into d6
move.l d4,d6
;move the address into r3
move.l d5,r3
; should be calculated on data and address also



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