LTC2400CS8 datasheet(31/40 Pages) LINER

31 / 40 page

LTC2400

Figure 32. This BASIC Stamp Code is an Example of How Easy it is to Retrieve Data from the LTC2400

ADlo.bit0 = in0

'and sample data line

low SCK

high CS

'Disable the LTC2400

ADhi = (ADhi<<4)+((ADlo&$F000)>>12)

debug ?ADhi

'Discard the lower eight bits

goto Start

'and display (debug command).

ShiftL

Temp = ADlo.bit15

'This routine simply

ADlo = ADlo<<1

'performs a 1 bit

ADhi = ADhi<<1

'left shift on two

ADhi.bit0 = Temp

'16 bit variables

return

TYPICAL APPLICATIONS

Figure 33. Connecting the LTC2400 to a 68HC11 MCU Using the SPI Serial Interface

LTC2400

SCK

SDO

SCK (PD4)

MISO (PD2)

SS (PD5)

68HC11

2400 F33

The listing in Figure 34 is a simple assembler routine for

the 68HC11 microcontroller. It uses PORT D, configuring

it for SPI data transfer between the controller and the

LTC2400. Figure 33 shows the simple 3-wire SPI

connection.

The code begins by declaring variables and allocating four

memory locations to store the 32-bit conversion result.

This is followed by initializing PORT D’s SPI configuration.

The program then enters the main sequence. It activates

the LTC2400’s serial interface by setting the SS output

low, sending a logic low to CS. It next waits in a loop for

a logic low on the data line, signifying end-of-conversion.

After the loop is satisfied, four SPI transfers are com-

pleted, retrieving the conversion. The main sequence ends

by setting SS high. This places the LTC2400’s serial

interface in a high impedance state and initiates another

conversion.

*****************************************************

* This example program transfers the LTC2400's 32-bit output

* conversion result into four consecutive 8-bit memory locations. *

*****************************************************

*68HC11 register definition

PORTD

EQU

$1008

Port D data register

" – , – , SS* ,CSK ;MOSI,MISO,TxD ,RxD"

DDRD

EQU

$1009

Port D data direction register

SPSR

EQU

$1028

SPI control register

"SPIE,SPE ,DWOM,MSTR;SPOL,CPHA,SPR1,SPR0"

SPSR

EQU

$1029

SPI status register

"SPIF,WCOL, – ,MODF; – , – , – , – "

SPDR

EQU

$102A

SPI data register; Read-Buffer; Write-Shifter

* RAM variables to hold the LTC2400's 32 conversion result

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