DSP56303 FREESCALE [Freescale Semiconductor, Inc], DSP56303 Datasheet - Page 228

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

Bootstrap Program
MC68302HOSTLD
HI08CONT
HI08LL
HI08NW
A-6
bra<HI08CONT
movep#%0000000000111000,x:M_HPCR
bset#HEN,x:M_HPCR
jclr#HRDF,x:M_HSR,*
movepx:M_HRX,a0
jclr#HRDF,x:M_HSR,*
movepx:M_HRX,r0
mover0,r1
do a0,HI08LOOP
jset#HRDF,x:M_HSR,HI08NW
jclr#HF0,x:M_HSR,HI08LL
enddo
bra<HI08LOOP
; HAEN= 0 Host acknowledge is disabled
; HREN= 1 Host requests are enabled
; HCSEN = 1 Host chip select input enabled
; HA9EN= 1 Enable address 9 input
; HA8EN= 1 Enable address 8 input
; HGEN= 0 Host GPIO pins are disabled
; Configure the following conditions:
; HAP= 0 Negative host acknowledge
; HRP= 0 Negative host request
; HCSP= 0 Negative chip select input
; HD/HS= 0 Single strobe bus (R/W~ and DS strobes)
; HMUX= 0 Non multiplexed bus
; HASP= 0 (address strobe polarity has no meaning in
;
; HDSP= 0 Negative data strobes polarity
; HROD= 0 Host request is active when enabled
; spare = 0 This bit should be set to 0 for future
; compatibility
; HEN= 0 When the HPCR register is modified HEN should be
; cleared
; HAEN= 1 Host acknowledge is enabled
; HREN= 1 Host requests are enabled
; HCSEN = 1 Host chip select input enabled
; HA9EN= 0 (address 9 enable bit has no meaning in
;
; HA8EN= 0 (address 8 enable bit has no meaning in
;
; HGEN= 0 Host GPIO pins are disabled
non-multiplexed bus)
non-multiplexed bus)
non-multiplexed bus)
; Enable the HI08 to operate as host
; interface (set HEN=1)
; wait for the program length to be
; written
; wait for the program starting address
; to be written
; set a loop with the downloaded length
;
DSP56303 User’s Manual, Rev. 2
; If new word was loaded then jump
;to read that word
; If HF0=0 then continue with the
; downloading
; Must terminate the do loop
counts
Freescale Semiconductor