DSP56303 datasheet(227/292 Pages) FREESCALE

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Bootstrap Code

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

A-5

; HEN

= 0 When the HPCR register is modified

;

HEN should be cleared

; HAEN

= 0 Host acknowledge is disabled

; HREN

= 1 Host requests are enabled

; HCSEN = 1 Host chip select input enabled

; HA9EN

= 0 (address 9 enable bit has no meaning in

;

non-multiplexed bus)

; HA8EN

= 0 (address 8 enable bit has no meaning in

;

non-multiplexed bus)

; HGEN

= 0 Host GPIO pins are disabled

bra<HI08CONT

HC11HOSTLD

movep#%0000001000011000,x:M_HPCR

; 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

;

non-multiplexed bus)

; HDSP= 1 Positive 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= 0 Host acknowledge is disabled

; HREN= 1 Host requests are enabled

; HCSEN = 1 Host chip select input enabled

; HA9EN= 0 (address 9 enable bit has no meaning in

;

non-multiplexed bus)

; HA8EN= 0 (address 8 enable bit has no meaning in

;

non-multiplexed bus)

; HGEN= 0 Host GPIO pins are disabled

bra<HI08CONT

I8051HOSTLD

movep#%0001110000011110,x:M_HPCR

; Configure the following conditions:

; HAP= 0 Negative host acknowledge

; HRP= 0 Negative host request

; HCSP= 0 Negative chip select input

; HD/HS= 1 Dual strobes bus (RD and WR strobes)

; HMUX= 1 Multiplexed bus

; HASP= 1 Positive address strobe polarity

; 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

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