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DSP56012 User’s Manual
MOTOROLA
Bootstrap ROM Contents
; “shild” is the routine that loads from the Serial Host Interface.
; MC:MB:MA = 101—bootstrap from SHI (SPI)
; MC:MB:MA = 111—bootstrap from SHI (IIC)
; If MC:MB:MA = 1X1, the internal Program RAM is loaded with 256 words
; received through the Serial Host Interface (SHI).
; The SHI operates in the Slave mode
; with the 10-word FIFO enabled, and with the HREQ pin enabled for
; receive operation. The word size for transfer is 24 bits. The SHI
; operates in the SPI or in the IIC mode, according to the bootstrap mode.
shild jclr #mb,omr,shi_loop ; If MC:MB:MA = 101, select SPI mode
bset #hi2c,r1 ; otherwise select I2C mode.
shi_loop movep
r1,x:hcsr ; enable SHI
do #256,_loop2
jclr #hrne,x:hcsr,* ; wait for HRX not empty
movep x:hrx,p:(r0)+ ; store in Program RAM
_loop2
; Exit bootstrap ROM
exit
clr a a0,r0 ; r0 points to destination address
andi #$ec,omr ; set operating mode to 0
; (and trigger an exit from
; bootstrap mode).
movep a1,x:bcr ; Delay needed for Op. Mode change
; used to clear BCR register.
jmp (r0) ; Then go to destination address.
; This code fills the unused bootstrap ROM locations with their address
dup $020-*
dc *
endm
Summary of Contents for DSP56012
Page 12: ...xii Motorola ...
Page 20: ...xx Motorola ...
Page 21: ...MOTOROLA DSP56012 User s Manual 1 1 SECTION 1 OVERVIEW ...
Page 40: ...1 20 DSP56012 User s Manual MOTOROLA Overview DSP56012 Architectural Overview ...
Page 41: ...MOTOROLA DSP56012 User s Manual 2 1 SECTION 2 SIGNAL DESCRIPTIONS ...
Page 61: ...SECTION 3 MEMORY OPERATING MODES AND INTERRUPTS ...
Page 81: ...MOTOROLA DSP56012 User s Manual 4 1 SECTION 4 PARALLEL HOST INTERFACE ...
Page 148: ...4 68 DSP56012 User s Manual MOTOROLA Parallel Host Interface Host Interface HI ...
Page 149: ...MOTOROLA DSP56012 User s Manual 5 1 SECTION 5 SERIAL HOST INTERFACE ...
Page 179: ...MOTOROLA DSP56012 User s Manual 6 1 SECTION 6 SERIAL AUDIO INTERFACE ...
Page 205: ...MOTOROLA DSP56012 User s Manual 7 1 SECTION 7 GPIO ...
Page 210: ...7 6 DSP56012 User s Manual MOTOROLA GPIO GPIO Register GPIOR ...
Page 211: ...MOTOROLA DSP56012 User s Manual 8 1 SECTION 8 DIGITAL AUDIO TRANSMITTER ...
Page 226: ...8 16 DSP56012 User s Manual MOTOROLA Digital Audio Transmitter DAX Programming Considerations ...
Page 233: ...MOTOROLA DSP56012 User s Manual B 1 APPENDIX B PROGRAMMING REFERENCE ...