MSP430F435IPZ datasheet(41/85 Pages) TI

41 / 85 page

MSP430x43x, MSP430x44x

MIXED SIGNAL MICROCONTROLLER

SLAS344A – JANUARY 2002 – REVISED FEBRUARY 2002

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

A/D converter (continued)

Table 7. Reference Voltage Configurations

SREF

VOLTAGE AT VR+

VOLTAGE AT VR–

AVCC

AVSS

VREF+ (internal)

AVSS

2, 3

VeREF+ (external)

AVSS

AVCC

VREF–/VeREF– (internal or external)

VREF+ (internal)

VREF–/VeREF– (internal or external)

6, 7

VeREF+ (external)

VREF–/VeREF– (internal or external)

control registers ADC12CTL0 and ADC12CTL1

All control bits are reset during POR. POR is active after VCC or a reset condition is applied to pin RST/NMI.

A more detailed description of the control bit functions is found in the ADC12 module description (in the user’s

guide). Most of the control bits in registers ADC12CTL0, ADC12CTL1, and ADC12MCTLx can only be modified

if ENC is low.

The following illustration highlights these bits. Six bits are excluded and can be unrestrictedly modified:

ADC12SC, ENC, ADC12TOVIE, ADC12OVIE, and CONSEQ.

The control bits of control registers ADC12CTL0 and ADC12CTL1 are:

01A0h

ADC12CTL0

ENC

2_5 V

ADC12

REF

ADC12

TOVIE

ADC12

OVIE

MSC

ADC12

rw–(0)

SHT1

SHT0

rw–(0)

rw–(0) rw–(0) rw–(0) rw–(0) rw–(0) rw–(0) rw–(0)

ADC12SC

01A0h, bit0

Sample and convert. The ADC12SC bit is used to control the conversion by software. It

is recommended that ISSH=0.

SHP=1: Changing the ADC12SC bit from 0 to 1 starts the sample and conversion

operation. Bit ADC12SC is automatically reset when the conversion is complete

(BUSY=0).

SHP=0: A high level of bit ADC12SC determines the sample time. Conversion starts once

it is reset (by software). The conversion takes 13 ADC12CLK cycles.

ENC

01A0h, bit1

Enable conversion. A conversion can be started by software (via ADC12SC) or by external

signals, only if the enable conversion bit ENC is high. Most of the control bits in

ADC12CTL0 and ADC12CTL1, and all the bits in ADCMCTL.x can only be changed if ENC

is low.

0: No conversion can be started. This is the initial state.

1: The first sample and conversion starts with the first rising edge of the sampling signal.

The operation selected proceeds as long as ENC is set.

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