DSP56303 FREESCALE [Freescale Semiconductor, Inc], DSP56303 Datasheet - Page 229

• Manufacturer Part Number: DSP56303
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

HI08LOOP
;========================================================================
EPRSCILD
;========================================================================
; This is the routine that loads from the SCI.
; MC:MB:MA=010 - external SCI clock
SCILD
_LOOP6
_LOOP8
_LOOP7
;========================================================================
; This is the routine that loads from external EPROM.
; MC:MB:MA=001
EPROMLD
Freescale Semiconductor
movepx:M_HRX,p:(r0)+
bra<FINISH
jclr #1,omr,EPROMLD
movep #$0302,X:M_SCR
movep #$C000,X:M_SCCR
movep #7,X:M_PCRE
do #6,_LOOP6
jclr #2,X:M_SSR,*
movep X:M_SRXL,A2
jclr #1,X:M_SSR,*
movep A2,X:M_STXL
asr #8,a,a
move a1,r0
move a1,r1
do a0,_LOOP7
do #3,_LOOP8
jclr #2,X:M_SSR,*
movep X:M_SRXL,A2
jclr #1,X:M_SSR,*
movep a2,X:M_STXL
asr #8,a,a
movem a1,p:(r0)+
bra <FINISH
move #BOOT,r2
movep #AARV,X:M_AAR1
do #6,_LOOP9
; Move the new word into its destination
; location in the program RAM
; If MC:MB:MA=001, go load from EPROM
; Configure SCI Control Reg
; Configure SCI Clock Control Reg
; Configure SCLK, TXD and RXD
; get 3 bytes for number of
; program words and 3 bytes
; for the starting address
; Wait for RDRF to go high
; Put 8 bits in A2
; Wait for TDRE to go high
; echo the received byte
; starting address for load
; save starting address
; Receive program words
; Wait for RDRF to go high
; Put 8 bits in A2
; Wait for TDRE to go high
; echo the received byte
; Store 24-bit result in P mem.
; Boot from SCI done
; r2 = address of external EPROM
; aar1 configured for SRAM types of access
; read number of words and starting address
DSP56303 User’s Manual, Rev. 2
Bootstrap Code
A-7