Bootstrap Programs
MOTOROLA
DSP56309UM/D A-9
move a1,r1 ; save starting address
do a0,_LOOP7 ; Receive program words
do #3,_LOOP8
jclr #2,X:M_SSR,* ; Wait for RDRF to go high
movep X:M_SRXL,A2 ; Put 8 bits in A2
jclr #1,X:M_SSR,* ; Wait for TDRE to go high
movep a2,X:M_STXL ; echo the received byte
asr #8,a,a
_LOOP8
movem a1,p:(r0)+ ; Store 24-bit result in P mem.
nop ; pipeline delay
_LOOP7
bra <FINISH ; Boot from SCI done
;========================================================================
; This is the routine that loads from external EPROM.
; MD:MC:MB:MA=1001
EPROMLD
move #BOOT,r2 ; r2 = address of external EPROM
movep #AARV,X:M_AAR1 ; aar1 configured for SRAM types of access
do #6,_LOOP9 ; read number of words and starting address
movem p:(r2)+,a2 ; Get the 8 LSB from ext. P mem.
asr #8,a,a ; Shift 8 bit data into A1
_LOOP9 ;
move a1,r0 ; starting address for load
move a1,r1 ; save it in r1
; a0 holds the number of words
do a0,_LOOP10 ; read program words
do #3,_LOOP11 ; Each instruction has 3 bytes
movem p:(r2)+,a2 ; Get the 8 LSB from ext. P mem.
asr #8,a,a ; Shift 8 bit data into A1
_LOOP11 ; Go get another byte.
movem a1,p:(r0)+ ; Store 24-bit result in P mem.
nop ; pipeline delay
_LOOP10 ; and go get another 24-bit word.
; Boot from EPROM done
;========================================================================
FINISH
; This is the exit handler that returns execution to normal
; expanded mode and jumps to the RESET vector.
andi #$0,ccr ; Clear CCR as if RESET to 0.
jmp (r1) ; Then go to starting Prog addr.
;========================================================================
; The following modes are reserved, some of which are used for internal testing
Содержание DSP56309
Страница 25: ...xxii DSP56309UM D MOTOROLA Figure D 25 Port E Registers PCRE PRRE PDRE D 39 ...
Страница 30: ...MOTOROLA DSP56309UM D 1 1 SECTION 1 DSP56309 OVERVIEW ...
Страница 47: ...1 18 DSP56309UM D MOTOROLA DSP56309 Overview DSP56309 Architecture Overview ...
Страница 48: ...MOTOROLA DSP56309UM D 2 1 SECTION 2 SIGNAL CONNECTION DESCRIPTIONS ...
Страница 85: ...2 38 DSP56309UM D MOTOROLA Signal Connection Descriptions OnCE JTAG Interface ...
Страница 86: ...MOTOROLA DSP56309UM D 3 1 SECTION 3 MEMORY CONFIGURATION ...
Страница 104: ...MOTOROLA DSP56309UM D 4 1 SECTION 4 CORE CONFIGURATION ...
Страница 124: ...MOTOROLA DSP56309UM D 5 1 SECTION 5 GENERAL PURPOSE I O ...
Страница 125: ...5 2 DSP56309UM D MOTOROLA General Purpose I O 5 1 INTRODUCTION 5 3 5 2 PROGRAMMING MODEL 5 3 ...
Страница 128: ...MOTOROLA DSP56309UM D 6 1 SECTION 6 HOST INTERFACE HI08 ...
Страница 166: ...MOTOROLA DSP56309UM D 7 1 SECTION 7 ENHANCED SYNCHRONOUS SERIAL INTERFACE ESSI ...
Страница 212: ...MOTOROLA DSP56309UM D 8 1 SECTION 8 SERIAL COMMUNICATION INTERFACE SCI ...
Страница 241: ...8 30 DSP56309UM D MOTOROLA Serial Communication Interface SCI GPIO Signals and Registers ...
Страница 242: ...MOTOROLA DSP56309UM D 9 1 SECTION 9 TRIPLE TIMER MODULE ...
Страница 269: ...9 28 DSP56309UM D MOTOROLA Triple Timer Module Timer Operational Modes ...
Страница 270: ...MOTOROLA DSP56309UM D 10 1 SECTION 10 ON CHIP EMULATION MODULE ...
Страница 302: ...MOTOROLA DSP56309UM D 11 1 SECTION 11 JTAG PORT ...
Страница 369: ...C 22 DSP56309UM D MOTOROLA DSP56309 BSDL Listing ...
Страница 370: ...MOTOROLA DSP56309UM D D 1 APPENDIX D PROGRAMMING REFERENCE ...
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