EB632 datasheet(98/112 Pages) FREESCALE

98 / 112 page

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

Freescale Semiconductor

Bootloader Program

;

d12: Used for watchdog handler function.

;

d14: Tx buffer address, for read_db function.

;

r2 : Pointer to address of Block data on EEPROM

;

r5 : The Rx Buffer pointer for read_bd function

;

r6 : IMMR + $0001_0000

;

r7 : IMMR

;

;The follow registers were initiated by the previous code (boot_code_revA1. )

;

d13:Contain the ISB Bits

;

d9 :IMMR

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; ------------------------------------------------------------------

; -----------------

SERIAL BOOT CODE START HERE

------------------

; ------------------------------------------------------------------

from_serial

move.l d9,r7

;d9&r7 will have always IMMR value

move.l r7,d11

move.l #$10000,d12

add

d11,d12,d11

move.l d11,r6;r6<-IMMR+$10000 for registers access

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;

Configure I2 Register &

;

Parameter RAM

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

move.l d9,r3

;r3 <-

IMMR

bmset

#I2C_BASE,r3.l;r3 receive I2C page base address

;sw watchdog

move.l #$0,d11;clear d11, software watchdog is not enabled

move.l (r6+$4),d12;get sypcr value

bmtsts #$0004,d12.l

jf init_

nop

move.l d11,r15 ; clear watchdog handle counter

move.l #$1,d11; indicate software watchdog enabled

move.l #$0100,r15

; initialize watchdog handle counter

;Initiate I2C_BASE

init_

move.w #I2C_BASE_VAL,d4

nop

;inserted due to restriction 6.4.4.a.2

move.w

d4,(r3);Save d4 into I2C_BASE

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;Initiate Parameter RAM

move.l

#RTBASEVAL,r1 ;RBASE=3e50,TBASE=3e40

nop

;due to restriction 6.4.4.a.2

move.l r1,(r7+RBASE);$00

move.l #$1212ff00,r1 ;RFCR=12(use local BUS),TFCR=12,MRLBR=ff00

EB632 Datasheet(PDF) 98 Page - Freescale Semiconductor, Inc

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