Motorola MCU 68HC912 Manual do Utilizador descarregar pdf (Página 10)

SLAA108A

10 SPI-Based Data Acquisition/Monitor Using the TLC2551 Serial ADC

68HC912 Code Example

;******************************************************************************

; Motorola 68HC912 Demo - SPI Communication with TLC2551 and TLV5616

; Using the M68EVB912B32 Demo Bd. with DeBug12

; Assembled with ASM12.EXE

; TLC2551 68HC912 TLV5616

; ------------- ------------- --------------

; | CS|<---|PS.7 PS.3|--->|FS |

; ~~~~>|IN+ SCLK|<---| PS.6 |--->|SCLK OUT+|~~~~>

; | SDO|--->|PS.4 PS.5|--->|SDI |

; | || || |

;

; T. Hendrick

; Analog Applications Group

; Texas Instruments, Inc

; August 2000

;************************************************************************

;* ----------------------------------------------------------------------

;* Equates and Variables

;* ----------------------------------------------------------------------

SP0CR1: equ $D0 ;SPI 0 Control Register 1

SP0CR2: equ $D1 ;SPI 0 Control Register 2

SP0BR: equ $D2 ;SPI 0 Baud Rate Register

SP0SR: equ $D3 ;SPI 0 Status Register

SP0DR: equ $D5 ;SPI 0 Data Register

PORTS: equ $D6 ;Port S Data Register

DDRS: equ $D7 ;Port S Data Direction Register

; User Variables

Upper_Byte: EQU $0B00

Lower_Byte: EQU $0B01

;* ----------------------------------------------------------------------

;* MAIN PROGRAM

;* ----------------------------------------------------------------------

ORG $0800 ; User code data area,

; start main program at $0800

DATA FCB 00,01 ; Set up 16 bit DATA

MAIN:

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Motorola MCU 68HC912 Manual do Utilizador Página 10