M32C83T datasheet(255/527 Pages) RENESAS

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Page 232

17. A/D Converter

)

(

Function

A/D1 Control Register 1(1)

Bit Name

Bit

Symbol

Address

After Reset

AD1CON1

01D716

XX00 00002

SCAN0

SCAN1

MD2

A/D Sweep Pin

Select Bit(2, 3, 4)

BITS

CKS1

VCUT

(b7 - b6)

8/10-bit Mode

Select Bit

VREF Connection Bit

0 : VREF not connected(6)

1 : VREF connected

Frequency Select

Bit(5)

0 : Select from fAD/2 or fAD/4

1 : Select from fAD/1 or fAD/3

0 : 8-bit mode

1 : 10-bit mode

A/D Operation

Mode Select Bit 1

0 0 : ANi0,ANi1 (ANi0)

0 1 : ANi0 to ANi3 (ANi0,ANi1)

1 0 : ANi0 to ANi5 (ANi0 to ANi2)

1 1 : ANi0 to ANi7 (ANi0 to ANi3) (i=0, 2, 15)

0 : Any mode other than repeat sweep

mode 1

1 : Repeat sweep mode 1

b1 b0

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

NOTES:

1. When the AD1CON1 register is rewritten during the A/D conversion, the conversion result is

indeterminate.

2. This bit is disabled in one-shot mode and repeat mode. Pins in parentheses are those most

commonly used for A/D conversions when the MD2 bit is set to "1" (repeat sweep mode 1).

3. The APS1 to APS0 bits in the AD1CON2 register select i=0, 2 or 15.

4. i=15 is available in the 144-pin package.

frequency must be under 16 MHz when VCC=5V.

frequency must be under 10 MHz when

VCC=3.3V. Combination of the CKS0 and CKS1 bits selects

(see the AD1CON0 register).

6. Do not set the VCUT bit to "0" during the A/D conversion. This is a reference voltage for the A/D1.

It does not affect the D/A conversion.

Figure 17.6 AD1CON1 Register

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