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B7 B6 B5 B4 B3 B2 B1 B7 B6 B5 B4 B3 B2 B1B0 B0

A14 A13 A12 A11 A10 A9 A8 A6 A5 A4 A3A7A15 A2 A1 A0

conv

I/O

CLOCK

DATA

OUT

EOC

( = 0) ( = 0)

Figure 5. TLC2543 to SPI Interface Timing

Software Flowcharts

Figures 6, 7, and 8 show the flow charts for the main program and subroutines used in the TLC2543 to TMS370C010

interface software shown in this application report. The same program structure also applies to the other three interfaces

included in this report.

Reads channel/mode data for TLC2543 into microcontroller via parallel I/O port.

(reformats channel/mode data if serial data is sent LSB first).

Puts channel/mode data into accessible register.

Derives destination address for STORE from channel data.

Provides CS high to low transition prior to conversion.

Provides serial I/O CLOCK to TLC2543.

Sends channel/mode data to TLC2543.

Receives MSbyte then LSbyte of previous A/D conversion.

Stores MSbyte in even address of selected RAM space.

Stores LSbyte in odd address of selected RAM space

(all addresses mapped to corresponding channel number).

Jump to start for next conversion

CALL

SUBROUTINE

DATAIN

CALL

SUBROUTINE

ADC

CALL

SUBROUTINE

STORE

JUMP TO

START

Figure 6. Flowchart for Main Program of TLC2543 to TMS370C010

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 25 26

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ADC 400F Spezifikationen Seite 8