Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  11   A/D  CONVERTER 

R01UH0305EJ0200  Rev.2.00 

 

 

373  

Jul 04, 2013 

 

<1>  In the stop status, the ADCE bit of A/D converter mode register 0 (ADM0) is set to 1, and the system enters the 

A/D conversion standby status. 

<2>  After the software counts up to the stabilization wait time

, the ADCS bit of the ADM0 register is set to 1 to 

perform the A/D conversion of the analog input specified by the analog input channel specification register (ADS). 

<3>  When A/D conversion ends, the conversion result is stored in the A/D conversion result register (ADCR, ADCRH), 

and the A/D conversion end interrupt request signal (INTAD) is generated. 

<4>  After A/D conversion ends, the ADCS bit is automatically cleared to 0, and the system enters the A/D conversion 

standby status. 

<5>  When ADCS is overwritten with 1 during conversion operation, the current A/D conversion is interrupted, and 

conversion restarts.  The partially converted data is discarded. 

<6>  When the value of the ADS register is rewritten or overwritten during conversion operation, the current A/D 

conversion is interrupted, and A/D conversion is performed on the analog input respecified by the ADS register.  

The partially converted data is discarded. 

<7>  When ADCS is cleared to 0 during conversion operation, the current A/D conversion is interrupted, and the 

system enters the A/D conversion standby status. 

<8>  When ADCE is cleared to 0 while in the A/D conversion standby status, the A/D converter enters the stop status.  

When ADCE = 0, specifying 1 for ADCS is ignored and A/D conversion does not start.  In addition, A/D 

conversion does not start even if a hardware trigger is input while in the A/D conversion standby status. 

 

Note  If a high-accuracy channel is selected as the analog input channel:  Stabilization wait time = 0.5 

μ

s 

If a standard channel is selected as the analog input channel: 

Stabilization wait time = 2 

μ

s 

 

 

ADCE

ADCS

ADS

INTAD

ADCR,

ADCRH

A/D

conversion

status

ADCE is set to 1.

<1>

ADCS is set to 
1 while in the 
conversion 
standby status.

ADCS is 
automatically 
cleared to 
0 after 
conversion 
ends.

<2>

<4>

<2>

<2>

<4>

<2>

<4>

A/D
conversion
ends.

<3>

ADCS is overwritten 
with 1 during A/D 
conversion operation.

<5>

Conversion is 
interrupted 
and restarts.

Conversion is

interrupted.

<3>

ADS is rewritten during 
A/D conversion operation 
(from ANI0 to ANI1).

<6>

<3>

ADCE is cleared to 0. <8>

ADCS is 
cleared to
0 during A/D 
conversion 
operation.

<7>

The trigger

is not

acknowledged.

The trigger
is not
acknowledged.

Conversion

standby

Conversion

standby

Conversion

standby

Conversion

standby

Conversion

standby

ANI0

ANI1

Stop

status

Data 1
(ANI0)

Data 2
(ANI0)

Data 1
(ANI0)

Data 3
(ANI0)

Data 5
(ANI1)

Data 3
(ANI0)

Data 4
(ANI0)

Data 5
(ANI1)

Data 6
(ANI1)

Stop

status