TMP05/TMP06

Rev. 0 | Page 20 of 28

YE S

NO

NO

YE S

NO

NO

YES

ENTER INTERRUPT

ROUTINE

CHECK IF TIMER 1

IS RUNNING

COPY TIMER 1 VALUES

INTO A REGISTER

RESET TIMER 1

START TIMER 1

IS TEMPSEGMENT

= 1

CALCULATE

TEMP_HIGH0

RESET TIMER 0

TO ZERO

IS TEMPSEGMENT

= 2

IS TEMPSEGMENT

= 3

CALCULATE

TEMP_LOW1

CALCULATE

TEMP_HIGH2

USING TIMER 0

VALUES

INCREMENT

TEMPSEGMENT

EXIT INTERRUPT

ROUTINE

CALCULATE

TEMP_LOW0

USING TIMER 1

VALUES

CALCULATE

TEMP_HIGH1

USING TIMER 0

VALUES

RESET TIMER 0

TO ZERO

YES

Figure 36. ADuC812 Interrupt Routine Flowchart

TMP05 Program Code Example 1

//=============================================================================================

// Description : This program reads the temperature from 2 daisy-chained TMP05 parts.

//

// This code runs on any standard 8052 part running at 11.0592MHz.

// If an alternative core frequency is used, the only change required is an

// adjustment of the baud rate timings.

//

// P3.2 = Daisy-chain output connected to INT0.

// P3.7 = Conversion control.

// Timer0 is used in gate mode to measure the high time.

// Timer1 is triggered on a high-to-low transition of INT0 and is used to measure

// the low time.

//=============================================================================================