MSP430 datasheet(36/88 Pages) TI

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7.3.2.8 ADC Bypass

To test the offset, modify the ADC data path by programming the bypass data register, ADC_BYP.DATA (2Eh).

This read/write register is used in two different ways.

First, this bypass data register is used as a substitute for the ADC_OFFSET by setting the

ADC_BYP.OFST_BYP_EN to 1.

Second, the ADC_BYP.DATA is used as the readback register for the data for the different settings of the custom

channel sequencer. The data are replaced by setting the ADC_BYP.DATA_BYP_EN bit. When this bit is set to 1,

the ADC conversion is bypassed, and the value of ADC_BYP.DATA is used in the readback channel. This setting

is used to test the alarm settings of the ADC.

When the ADC bypass is unused, set the ADC_BYP.DATA to 000h.

Figure 7-11 shows the ADC bypass data flow.

ADC_BYP.DATA

ADC_OFFSET

ADC_AIN0

ADC_AIN1

ADC_TEMP

ADC_SD_MUX

ADC_BYP.

OFST_BYP_EN

ADC_BYP.

DATA_BYP_EN

ADC Data

From ADC MUX

ADC.

ADC_OUT

ADC

MUX

07FFh – OFFSET

Stored as 2’s Complement

CCS Pointer

Read and Writeable

for Testing

Figure 7-11. ADC Bypass Data Flow

7.3.3 Programmable Out-of-Range Alarms

The AFEx8101 are capable of continuously analyzing the supplies, external ADC inputs, DAC output voltage,

reference, internal temperature, and other internal signals for normal operation.

Normal operation for the conversion results is established through the lower- and upper-threshold registers.

When any of the monitored inputs are out of the specified range, the corresponding alarm bit in the alarm status

registers is set.

The alarm bits in the alarm status registers are latched. The alarm bits are referred to as being latched because

the alarm bits remain set until read by software. This design makes sure that out-of-limit events cannot be

missed if the software is polling the device periodically. All bits are cleared when reading the alarm status

registers, and all bits are reasserted if the out-of limit condition still exists on the next monitoring cycle.

All of the alarms can be set to activate the ALARM pin. The ALARM pin works as an interrupt to the host so that

the host can query the alarm status registers to determine the alarm source. Any alarm event activates the pin

as long as the alarm is not masked in the ALARM_STATUS_MASK register. When an alarm event is masked,

the occurrence of the event sets the corresponding status bit in the alarm status registers, but does not activate

the ALARM pin.

In addition, Section 7.3.3.1 describes how the alarm action can be individually configured for each alarm. When

the alarm event is cleared, the DAC is reloaded with the contents of the DAC active registers, which allows the

DAC outputs to return to the previous operating point without any additional commands.

AFE78101, AFE88101

SLASF21 – DECEMBER 2022

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MSP430 Datasheet(PDF) 36 Page - Texas Instruments

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