TMS370 datasheet(22/43 Pages) TI

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TMS370Cx32

8-BIT MICROCONTROLLER

SPNS015C – FEBRUARY 1990 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

analog-to-digital converter 1 module

The analog-to-digital converter 1 (ADC1) module is an 8-bit, successive approximation converter with internal

sample-and-hold circuitry. The module has four multiplexed analog input channels that allow the processor to

convert the voltage levels from up to eight different sources. The ADC1 module features include the following:

D Minimum conversion time: 32.8 µs at 5 MHz SYSCLK

D Ten external pins:

–

Eight analog-input channels (AN0 – AN7), any of which can be software-configured as digital inputs

(E0 – E7) when not needed as analog channels

–

AN1 – AN7 also can be configured as positive-input voltage reference.

–VCC3: ADC1 module high-voltage reference input

–VSS3: ADC1 module low-voltage reference input

D The ADDATA register, which contains the digital result of the last ADC1 conversion.

D ADC1 operations can be accomplished through either interrupt-driven or polled algorithms.

D Six ADC1 module control registers located in the control-register frame beginning at address 1070h

The ADC1 module control registers are listed in Table 14.

Table 14. ADC1 Module Control Register Memory Map

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

REG

P070

CONVERT

START

SAMPLE

START

REF VOLT

SELECT2

REF VOLT

SELECT1

REF VOLT

SELECT0

AD INPUT

SELECT2

AD INPUT

SELECT1

AD INPUT

SELECT0

ADCTL

P071

—

AD READY

AD INT

FLAG

AD INT

ENA

ADSTAT

P072

A/D Conversion Data Register

ADDATA

P073

P07C

Reserved

P07D

Port E Data Input Register

ADIN

P07E

Port E Input Enable Register

ADENA

P07F

AD STEST

PRIORITY

AD ESPEN

—

ADPRI

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