EB632 datasheet(93/112 Pages) FREESCALE

Part #	EB632

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

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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Bootloader Program

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

Freescale Semiconductor

93

;check the check sticky bit is set ( HF3 in HSR

(HSR[3) )

move.w HSR,d6

and #$00001000,d6,d6

;check if the sticky bit is set ( HF7 in HCR(HCR[3]) )

move.w HCR,d4

and #$00001000,d4,d4

;if both of the flags are set start the loading again

and d4,d6

tsteq d6

jf from_host

nop

; jump to the destination address

jmp

r3

load_from_fifo

tsteq d15 ; check flag if watchdog disabled

jt load_no_wd

load_wd deceqa r15

nop

ift jsr watchdog_handle

HSR_read move.w HSR,d4

bmtsts.w #$0001,d4.l

jf

load_wd

nop

jmp read_fifo

nop

load_no_wd

;if the host is empty wait for it to fill

move.w HSR,d4

bmtsts.w #$0001,d4.l

jf

load_no_wd

; the host is not empty so load 8 bytes from it

read_fifo move.l #HORX,r0

nop

move.2l (r0),d4:d5

rts

; Set the sticky bit (HF7) if there is an error in loading the program

set_sticky_bit

;set the HF7 bit in HCR

move.w HCR,d6

or #$00001000,d6.l

move.w d6,HCR

rts

watchdog_handle

move.l #$0100,r15

move.w #$556c,d12

move.w d12,(r6+$e) ;write $556c to swsr

move.w #$aa39,d12

move.w d12,(r6+$e) ;write $aa39 to swsr

rts

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EB632 Datasheet(PDF) 93 Page - Freescale Semiconductor, Inc

EB632 Datasheet(HTML) 93 Page - Freescale Semiconductor, Inc

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