EB632 datasheet(105/112 Pages) FREESCALE

105 / 112 page

Bootloader Program

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

Freescale Semiconductor

105

;This routine will create 2 Tx BD and one Rx BD That receive the data

;Before enter these routine the registers must be setted as follow:

;

d9 : IMMR

;

d4 : Rx Buffer Pointer base (SRAM base)

;

d5 : The address of EEPORM to be read (Shifted 1 byte)

;

d14: Tx buffer address

;

left, e.g add=$4 -> d5 = $0400)

;

d7 : The lenght for RX BD

;

r6 : IMMR + $1_0000

;

r5 : Rx Buffer Pointer offset

;Corrupted registers:

;

d1,d3,d6 ,r0,r1,r3

;**************************************************

retry

move.w #$0017,r1

move.b r1,(r6+I2CER)

;Clear all previous events

;Prepare the 2 TX & 1 Rx BD's

to read 2 bytes from add8ess at d5

move.l #TBASEVAL,d1

; d1<-TBASE

nop

;due to restriction 6.4.4.a.2

add

d9,d1,d1; d1<-TX BD ptr

move.l d1,r0

; r0<-TX BD ptr

;**************************************************

;Prepare 2 Tx & 1 Rx BD

;**************************************************

; First Tx BD

move.l

#$84000003,d1;BD STATUS(R=1,I=1,L=0,S=1)|DATA Lenght = 3

move.l d1,(r0)

move.l d14,(r0+$4)

;Tx buffer address

; Write TX Buffer DATA

move.l d14,r3

;r3 receive the Tx Buffer ptr

move.l #AWSLAVEADDRESS,d6

extractu #$20,#0,d6,d6;remove the extend bits

add

d5,d6,d6

;d5=SLAVE ADDRESS | ADDRESS WORD

move.l d6,(r3)

; 2nd TX BD

move.l

#$bc000001,d3;BD STATUS(R=1,I=1,w=1,L=1,S=1)|Lenght

= 1

add

d7,d3,d3;set

Lenght = d7 + 1

move.l d3,(r0+$8)

move.l d14,d6

add

#$4,d6

; d6<-2nd TX Buffer Pointer

move.l d6,(r0+$c)

; Write TX Buffer DATA for second Buffer

move.l #ARSLAVEADDRESS,d6

extractu #$20,#0,d6,d6;remove the extend bits

move.l d6,(r3+4)

;Prepare the Rx BD

move.l #RBASEVAL,d1

; d1<- RBASE

add

d9,d1,d1; d1<- BD ptr

nop

;due to restriction 6.4.4.a.2

move.l d1,r1

; r1<- BD ptr

nop

;due to restriction 6.4.4.a.2

EB632 датащи(PDF) 105 Page - Freescale Semiconductor, Inc

EB632 датащи(HTML) 105 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL