EB632 datasheet(89/112 Pages) FREESCALE

Numer części	EB632

Szczegółowy opis	Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M)

PDF	112 Pages

Scroll/Zoom	100%

Producent	FREESCALE [Freescale Semiconductor, Inc]

Strona internetowa	http://www.freescale.com

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89 / 112 page

Bootloader Program

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

Freescale Semiconductor

eor d4,d7

eor d5,d7

; check if the finished (HF4) bit 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,d4

bmtsts.w #$8000,d4.l

jf continue_loading_16

move.w HCR,d4

and #$6fff,d4.l

move.w d4,HCR

continue_loading_16

;if (size == 0 ) in the beggining of a block it means no more blocks

;then jump to the address loaded in r3 (from d5 )

tsteq

jt end_of_loading_16

load_loop_16

;if (size ==2 ) it is a special case so goto load_last_long_2_16

move.l #$00000002,d4

cmpeq d4,d6

load_last_long_2_16

;load 2 data words

jsr load_from_fifo

;load the first 2 data words (4 bytes) to the address

move.l d4,(r3)

;increment the address by 4 bytes

adda #$4,r3

;load the second 2 data words (4 bytes) to the address

move.l d5,(r3)

;increment the address by 4 bytes

adda #$4,r3

;CALCULATE_CHECKSUM

eor d4,d7

eor d5,d7

;decrease the size by 4 words

sub #$4,d6

;jump to loading the next words

jmp load_loop_16

load_8bit

move.l #0,d7 ; un-initialized dalu register.

;load the size into d6

jsr load_from_fifo

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