7220 datasheet(89/303 Pages) RENESAS

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2-62

7220 Group User’s Manual

FUNCTIONAL DESCRIPTION

2.9 A-D comparator

b7 b6 b5 b4 b3 b2 b1 b0

A-D control register 2(AD2) [Address 00EF16]

After reset

A-D Control Register 2

6, 7

Name

Functions

D-A converter set bits

(ADC0, ADC1, ADC2,

ADC3, ADC4, ADC5)

Nothing is assigned. These bits are write disable bits.

When these bits are reed out, the values are “ 0.”

0000

111

1111

: 3/128Vcc

: 5/128Vcc

: 123/128Vcc

: 125/128Vcc

: 127/128Vcc

: 1/128Vcc

R—

Fig. 2.9.3 A-D control register 2 (address 00EF16)

Fig. 2.9.2 A-D control register 1 (address 00EE16)

Table 2.9.1 Relationship between contents of A-D control register 2 and reference voltage “Vref”

A-D control register 2

bit 3

bit 4

bit 5

bit 2

bit 1

bit 0

Internal analog voltage

(comparison voltage Vref)

1/128VCC

3/128VCC

5/128VCC

123/128VCC

125/128VCC

127/128VCC

b7 b6 b5 b4 b3 b2 b1 b0

A-D control register 1 (AD1) [Address 00EE16]

After reset RW

A-D Control Register 1

Analog input pin selection

bits

(ADM0, ADM1, ADM2)

Name

Functions

b2 b1 b0

0 : A-D1

1 : A-D2

0 : A-D3

1 : A-D4

0 : A-D5

1 : A-D6

0 :

1 :

Storage bit of comparison

result (ADM4)

0: Input voltage < reference voltage

1: Input voltage > reference voltage

Nothing is assigned. These bits are write disable bits.

When these bits are read out, the values are “0.”

Indeterminate

Do not set.

Nothing is assigned. This bit is a write disable bit.

When this bit is read out, the value is “0.”

R—

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