Renesas M16C User Manual

Rev.1.10    Jul 01, 2005    page 184 of 318
REJ09B0124-0110

M16C/6N Group (M16C/6NK, M16C/6NM)

15. A/D Converter

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

 

NOTES:

1. If the ADCON2 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. The 

φAD frequency must be 10 MHz or less. The selected φAD frequency is determined by a combination of the

CKS0 bit in the ADCON0 register, the CKS1 bit in the ADCON1 register, and the CKS2 bit in the ADCON2 register.

 

 

b7

b6

b5

b4

b3

b2

b1

b0

0

Symbol

Address

After Reset

ADCON2

03D4h

00h

A/D Control Register 2 

(1)

Bit Symbol

Bit Name

Function

RW

RW

RW

RW

RW

RW

-

SMP

CKS2

ADGSEL0

ADGSEL1

-

(b3)

-

(b7-b5)

b2 b1

 

Nothing is assigned. When write, set to "0".
When read, their contents are "0".

A/D Input Group Select Bit

A/D Conversion Method
Select Bit

Reserved Bit

Frequency Select Bit 2 

(2)

0 : Without sample and hold
1 : With sample and hold

0 0 : Port P10 group is selected
0 1 : Do not set a value
1 0 : Port P0 group is selected
1 1 : Port P2 group is selected

Set to "0"

0 : Selects fAD, divide-by-2 of fAD, or 

divide-by-4 of fAD.

1 : Selects divide-by-3 of fAD, divide-by-6

of fAD, or divide-by-12 of fAD.

Divide-by-4 of fAD

Divide-by-2 of fAD

fAD

Divide-by-12 of fAD

Divide-by-6 of fAD

Divide-by-3 of fAD

0

0

0

1

1

1

1

0

0

0

1

0

0

1

1

1

0

1

0

0

1

0

1

1

CKS2

CKS1

CKS0

φAD

(b15)

b7

b7

b0

b0

(b8)

A/D Register i (i = 0 to 7)

Low-order 8 bits of
A/D conversion result

 

Function

When BITS bit in ADCON1
register is "1" (10-bit mode) 

Nothing is assigned. When write, set to "0". 
When read, their contents are "0".

When read, the content is 
indeterminate.

RW

-

RO

RO

High-order 2 bits of
A/D conversion result

 

When BITS bit is "0"

(8-bit mode) 

A/D conversion result

Symbol

Address

After Reset

AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7

03C1h to 03C0h
03C3h to 03C2h
03C5h to 03C4h
03C7h to 03C6h
03C9h to 03C8h
03CBh to 03CAh
03CDh to 03CCh
03CFh to 03CEh

Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate