ZAMC4100 datasheet(90/156 Pages) RENESAS

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ZAMC4100 Datasheet

January 26, 2016

Left-Justified ADC Results

This setting applies when bit RESJSTF = 0. The digitized data of bits [9:2] go to ADCRESH, while the remaining

bits [1:0] go to ADCRESL as shown in Figure 3.24. For correct SPI extraction of the result, the ADRESH is read

first, where it clears the interrupt flag ADCRDYIF as well as updating the value ADCRESL. This guarantees

protection of the results from the next conversion.

Right-Justified ADC Results

This setting applies when bit RESJSTF = 1. The digitized data of bits [7:0] go to ADCRESL, while the remaining

bits [9:8] go to ADCRESH as shown in Figure 3.24. For correct SPI extraction of the result, the ADRESL is read

first, where it clears the interrupt flag ADCRDYIF as well as updating the value ADCRESH. This guarantees

protection of results from the next conversion.

Signed or Unsigned ADC Results

Bit RESSIGN configures the signed or unsigned result format when the ADC is performing ratiometric conversion.

When RESSIGN = 0, the ADC result is represented as unsigned value. When RESSIGN = 1, the ADC result is

represented as signed value.

Note: If the ADC is performing absolute or temperature conversion, the result is unsigned regardless of the value

of the RESSIGN bit.

Note: For the right-justified signed results format, the unused bits of ADCRESH have the value of the sign bit.

Figure 3.24 ADC Result Formatting Options

2 1 0

ADCRESL

ADCRESH

0 7

ADCRESL

ADCRESH

0 7

Unsigned RESSIGN = 0

Signed RESSIGN = 1

S = Sign bit:

0 = Positive result

1 = Negative result

=> RESCODE (ADCRES[9:0])

(Software Variable)

LEFT JUSTIFIED

8 7

ADCRESL

ADCRESH

0 7

ADCRESL

ADCRESH

0 7

Unsigned RESSIGN = 0

Signed RESSIGN = 1

S = Sign bit:

0 = Positive result

1 = Negative result

=> RESCODE (ADCRES[9:0])

(Software Variable)

Read S

RIGHT JUSTIFIED

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