M32CSLASH8B datasheet(271/406 Pages) RENESAS

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M32C/8B Group

18. A/D Converter

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 254 of 385

Figure 18.3

AD0CON1 Register

b7 b6 b5 b4

A/D0 Control Register 1(1)

Symbol

AD0CON1

Address

0397h

Bit Symbol

After Reset

00h

NOTES:

1. If the AD0CON1 register is rewritten during A/D conversion, the conversion result will be incorrect.

2. Bits SCAN1 and SCAN0 are enabled in single sweep mode, repeat sweep mode 0, 1, multi-port single sweep mode, and multi-

port repeat sweep mode 0.

3. These are prioritized pins used for A/D conversion when the MD2 bit is set to 1.

4. When the MSS bit in the AD0CON3 register is set to 1 (multi-port sweep mode used);

-set bits SCAN1 and SCAN0 to 11b

-set the MD2 bit to 0

-set bits OPA1 and OPA0 to 00b.

5. Refer to the note for the CKS0 bit in the AD0CON0 register.

6. Bits OPA1 and OPA0 can be set to 01b or 10b in one-shot mode and repeat mode. Set these bits to 00b or 11b in other modes.

7. Do not set the VCUT bit to 0 during A/D conversion. Even if the VCUT bit is set to 0, VREF remains connected to the D/A

converter.

8. When the VCUT bit is set to 1 from 0, wait for 1

μs or more to start the A/D conversion.

MD2

VCUT

BITS

CKS1

OPA0

OPA1

SCAN0

SCAN1

Bit Name

Resolution select bit

A/D operating mode

select bit 1(4)

Frequency select bit 1

VREF connection bit(8)

Extended input pin function

select bits(4, 6)

A/D sweep pin select bits(2)

Function

0: 8-bit mode

1: 10-bit mode

(Note 5)

0: Other than repeat sweep mode 1

1: Repeat sweep mode 1

b7 b6

0 0: ANEX0 and ANEX1 are not used

0 1: Signal applied to ANEX0 is A/D converted

1 0: Signal applied to ANEX1 is A/D converted

1 1: External op-amp connection

0: VREF not connected(7)

1: VREF connected

Single sweep mode and repeat sweep mode 0

b1 b0

0 0: ANi_0, ANi_1 (i = none, 0, 2, 15)

0 1: ANi_0 to ANi_3

1 0: ANi_0 to ANi_5

1 1: ANi_0 to ANi_7

Repeat sweep mode 1(3)

b1 b0

0 0: ANi_0

0 1: ANi_0, ANi_1

1 0: ANi_0 to ANi_2

1 1: ANi_0 to ANi_3

Multi-port single sweep mode and multi-port

repeat sweep mode 0(4)

Set to 11b.

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