R8CSLASH20 datasheet(379/501 Pages) RENESAS

379 / 501 page

R8C/20 Group, R8C/21 Group

18. A/D Converter

Rev.2.00 Aug 27, 2008

Page 363 of 458

REJ09B0250-0200

Figure 18.3

Registers ADCON1, ADCON2, and AD

A/D Control Register 1

(1)

Symbol

Address

After Reset

ADCON1

00D7h

00h

Bit Symbol

Bit Name

Function

NOTES:

3. When the VCUT bit is set to 1 (connected) from 0 (not connected), w ait for 1 µs or more before starting A/D

conversion.

b3 b2

VCUT

b1 b0

Refer to a description of the CKS0 bit in the

ADCON0 register function

b7 b6 b5 b4

—

(b2-b0)

If the ADCON1 register is rew ritten during A/D conversion, the conversion result is indeterminate.

CKS1

—

(b7-b6)

Reserved Bit

Vref connect bit(3)

0 : Vref not connected

1 : Vref connected

Set the BITS bit to 0 (8-bit mode) in repeat mode.

Reserved bit

Set to 0

8/10-bit mode select bit(2)

0 : 8-bit mode

1 : 10-bit mode

Set to 0

Frequency select bit 1

BITS

A/D Control Register 2

(1)

Symbol

Address

After Reset

ADCON2

00D4h

00h

Bit Symbol

Bit Name

Function

NOTE:

b3 b2 b1

Reserved bit

Set to 0

b7 b6 b5 b4

0 : Without sample and hold

1 : With sample and hold

If the ADCON2 register is rew ritten during A/D conversion, the conversion result is indeterminate.

SMP

A/D conversion method select bit

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

—

(b7-b4)

—

(b3-b1)

A/D Register

Symbol

Address

After Reset

00C1h-00C0h

Indeterminate

Function

When BITS bit in ADCON1 register is set to 1

(10-bit mode)

When BITS bit in ADCON1 register is set to 0

(8-bit mode)

8 low -order bits in A/D conversion result

A/D conversion result

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

—

2 high-order bits in A/D conversion result

When read, its content is indeterminate

(b8)

(b15)

R8C/20 Datasheet(PDF) 379 Page - Renesas Technology Corp

R8C/20 Datasheet(HTML) 379 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL