Starting A/D Conversion With Asynchronous Trigger; Starting A/D Conversion With Synchronous Trigger From Peripheral Module; Programmable Gain Amplifier - Renesas RX100 Series User Manual

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Starting A/D Conversion with Asynchronous Trigger

The A/D conversion can be started by the input of an asynchronous trigger. To start up the A/D converter by an

asynchronous trigger, the A/D conversion start trigger select bits (ADSTRGR.TRSA[5:0]) should be set to 000000b, and

a high-level signal should be input to the asynchronous trigger (ADTRG0# pin). Then, the ADCSR.TRGE and

ADCSR.EXTRG bits should be set to 1. Figure 26.31 shows a timing of the asynchronous trigger input.

For the time from when the ADST bit is set to 1 until conversion starts, refer to section 26.6.3, A/D Conversion

Restarting Timing and Termination Timing .

Figure 26.31

Timing of Sampling Asynchronous Trigger

The A/D conversion can be started by a synchronous trigger. To start the A/D conversion by a synchronous trigger, the

ADCSR.TRGE bit should be set to 1, the ADCSR.EXTRG bit should be cleared to 0, and the relevant sources should be

selected by the ADSTRGR.TRSA[5:0] and ADSTRGR.TRSB[5:0] bits.

A programmable gain amplifier is included in AN000 to AN002. Select the gain by setting the

S12AD.ADPGAGS.PnGAIN[3:0] bits (n = 000 to 002) for the AN000 to AN002 pins. Select the operational amplifier to

be used by setting the S12AD.ADPGACR.PnSEL1 bit (n = 000 to 002) for the AN000 to AN002 pins.

After setting the S12AD.ADPGACR.PnENAMP bit (n = 000 to 002) for the AN000 to AN002 pins to 1, wait for the

period for stabilizing of the programmable gain amplifier operation and set the ADCSR.ADST bit of the unit to 1.

R01UH0822EJ0100 Rev.1.00

Jul 31, 2019

Timing of sampling the asynchronous trigger

Asynchronous trigger

Internal trigger signal

26. 12-Bit A/D Converter (S12ADF)

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