Renesas 16-bit single-chip microcomputer Manual De Usuario

Rev.1.02    Jul 01, 2005    page 182 of 314
REJ09B0126-0102

M16C/6N Group (M16C/6NL, M16C/6NN)

15. A/D Converter

This document is under development and its contents are subject to change.

CH0

CH1

CH2

MD0

MD1

TRG

ADST

CKS0

0 0 : One-shot mode

 (3)

0 : Software trigger
1 : ADTRG trigger

0 : A/D conversion disabled
1 : A/D conversion started

Refer to NOTE 2 for ADCON2 
Register

Trigger Select Bit

A/D Conversion Start Flag

Frequency Select Bit 0

Analog Input Pin Select Bit

A/D Operation Mode 
Select Bit 0

A/D Control Register 0 

(1)

b7

b6

b5

b4

b3

b2

b1

b0

Bit Symbol

Bit Name

Function

RW

RW

RW

RW

RW

RW

RW

RW

RW

Symbol

Address

After Reset

ADCON0

03D6h

00000XXXb

b4 b3

0 0 0 : AN0 is selected
0 0 1 : AN1 is selected
0 1 0 : AN2 is selected
0 1 1 : AN3 is selected
1 0 0 : AN4 is selected
1 0 1 : AN5 is selected
1 1 0 : AN6 is selected
1 1 1 : AN7 is selected 

(2) (3)

b2 b1 b0

0

RW

RW

RW

RW

RW

RW

RW

RW

SCAN0

SCAN1

MD2

BITS

VCUT

OPA0

OPA1

CKS1

Bit Name

Function

Bit Symbol

RW

Symbol

Address

After Reset

ADCON1

03D7h

00h

0 : 8-bit mode
1 : 10-bit mode

Set to "0" when one-shot mode
is selected

1 : VREF connected

Refer to NOTE 2 for ADCON2 
Register

Invalid in one-shot mode

A/D Sweep Pin Select Bit

8/10-Bit Mode Select Bit

VREF Connect Bit 

(2)

A/D Operation Mode
Select Bit 1

External Op-Amp 
Connection Mode Bit

Frequency Select Bit 1

0 0 : ANEX0 and ANEX1 are not used
0 1 : ANEX0 input is A/D converted
1 0 : ANEX1 input is A/D converted
1 1 : External op-amp connection mode

b7

b6

b5

b4

b3

b2

b1

b0

A/D Control Register 1 

(1)

NOTES:

1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. If the VCUT bit is reset from "0" (VREF unconnected) to "1" (VREF connected), wait for 1 

µs or more before

starting A/D conversion.

b7 b6

1

0

0

NOTES:

1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. AN0_0 to AN_7, and AN2_0 to AN2_7 can be used in same way as AN0 to AN7. Use the ADGSEL1 to ADGSEL0 

bits in the ADCON2 register to select the desired pin.

3. After rewriting the MD1 to MD0 bits, set the CH2 to CH0 bits over again using another instruction.