Renesas R8C/Tiny Series Manuál stáhnout pdf (Strana 179)

R8C/10 Group 19. Usage Notes

Rev.1.20 Jan 27, 2006 page 169 of 180

REJ09B0019-0120

19.6 A/D Converter

(1) When writing to each bit but except bit 6 in the ADCON0 register, each bit in the ADCON1 register, or

the SMP bit in the ADCON2 register, A/D conversion must be stopped (before a trigger occurs).

When the VCUT bit in the ADCON1 register is changed from “0” (VREF not connected) to “1” (VREF

connected), wait at least 1 µs before starting A/D conversion.

(2) When changing AD operation mode, select an analog input pin again.

(3) In one-shot mode, A/D conversion must be completed before reading the AD register. The IR bit in

the ADIC register or the ADST bit in the ADCON0 register can indicates whether the A/D conversion

is completed or not.

(4) In repeat mode, the undivided main clock must be used for the CPU clock.

(5) If A/D conversion is forcibly terminated while in progress by setting the ADST bit in the ADCON0

the ADST bit is set to “0” in a program, ignore the value of AD register.

(6) A 0.1 µF capacitor should be connected between the AVcc/VREF pin and AVss pin.

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Renesas R8C/Tiny Series Manuál Strana 179