Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller TSSOP 28 16-Bit 16 MHz I/O number 24

601

602

603

604

605

606

607

608

609

610

Celsius

Volts

0 50 100

0.350

0.250

0.300

0.400

0.450

0.500

−50

0.200

Sensor,typ

= TC

Sensor

(273 + T[

C]) + V

Offset, sensor

[mV]

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SD16_A Operation

Figure 26-8. Typical Temperature Sensor Transfer Function

26.2.11 Interrupt Handling

The SD16_A has 2 interrupt sources for its ADC channel:

• SD16IFG

• SD16OVIFG

The SD16IFG bit is set when the SD16MEM0 memory register is written with a conversion result. An

interrupt request is generated if the corresponding SD16IE bit and the GIE bit are set. The SD16_A

overflow condition occurs when a conversion result is written to SD16MEM0 location before the previous

conversion result was read.

26.2.11.1 SD16IV, Interrupt Vector Generator

All SD16_A interrupt sources are prioritized and combined to source a single interrupt vector. SD16IV is

used to determine which enabled SD16_A interrupt source requested an interrupt. The highest priority

SD16_A interrupt request that is enabled generates a number in the SD16IV register (see register

description). This number can be evaluated or added to the program counter to automatically enter the

appropriate software routine. Disabled SD16_A interrupts do not affect the SD16IV value.

Any access, read or write, of the SD16IV register has no effect on the SD16OVIFG or SD16IFG flags. The

SD16IFG flags are reset by reading the SD16MEM0 register or by clearing the flags in software.

SD16OVIFG bits can only be reset with software.

If another interrupt is pending after servicing of an interrupt, another interrupt is generated. For example, if

the SD16OVIFG and one or more SD16IFG interrupts are pending when the interrupt service routine

accesses the SD16IV register, the SD16OVIFG interrupt condition is serviced first and the corresponding

flag(s) must be cleared in software. After the RETI instruction of the interrupt service routine is executed,

the highest priority SD16IFG pending generates another interrupt request.

609

SLAU144J–December 2004–Revised July 2013 SD16_A

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