EKTF6708 datasheet(98/158 Pages) EMC

98 / 158 page

eKTF6708

8-Bit Microcontroller



IC Product Specification (V1.2) 03.12.2020

(This specification is subject to change without prior notice)

This is a 12-bit successive approximation register analog-to-digital converter (SAR ADC).

There are two reference voltages for SAR ADC. The positive reference voltage can select

internal AVDD, internal voltage sources or external input pin by setting the VREFP1~0 and

VPIS1~0 bits in ADCR2. Connecting to external positive reference voltage provides more

accuracy than using internal AVDD.

6.6.1 ADC Data Register

When the AD conversion is completed, the result is loaded to the ADDH and ADDL. And

the ADSF is set if ADIE is enabled.

6.6.2 A/D Sampling Time

The accuracy, linearity, and speed of the successive approximation AD converter are

dependent on the properties of the ADC. The source impedance and the internal sampling

impedance directly affect the time required to charge the sample and hold capacitor. The

application program controls the length of the sample time to meet the specified accuracy.

The maximum recommended impedance for the analog source is 10k

 at VDD = 5V. After

the analog input channel is selected; this acquisition time must be done before AD

conversion can be started.

6.6.3 A/D Conversion Time

CKR2~0 select the conversion time (TAD). This allows the MCU to run at maximum

frequency without sacrificing the accuracy of AD conversion. The following tables show

the relationship between TAD and the maximum operating frequencies. The TAD is 1µs for

3V~5.5V and TAD is 4µs for 2.5V~3V

System

Mode

CKR2~0

Clock

Rate

Max. System

Operation

Frequency in

2.5~3V

Max. System

Operation

Frequency in

3~5.5V

Normal

Mode

000

FMain/4

4 MHz

001

FMain/8

8 MHz

010

FMain/16

4 MHz

16 MHz

011

FMain/32

8 MHz

16 MHz

100

FMain/64

12 MHz

16 MHz

101

FMain/128

16 MHz

110

FMain/256

16 MHz

111

FSub

Green

Mode

xxx

FSub

6.6.4 ADC Operation during Sleep Mode

In order to obtain a more accurate ADC value and reduce power consumption, the AD

conversion remains operational during sleep mode. As the SLEP instruction is executed,

all MCU operations will stop except for the Oscillator, TCC, TC1, PWM and AD conversion.

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