W79E804ADG 参数 Datasheet PDF下载

W79E804A/803A/802A

19. ANALOG COMPARATORS

The W79E804 series are provided two Comparators. Input and output options allow use of the

comparators in a number of different Configurations. The Comparator output is a logical one when its

positive input is greater than its negative input. Otherwise, the output is a zero. Each Comparator can

be configured to cause to an interrupt when the output value change. The block diagram is as below.

Each Comparator has a control register (CMP1 and CMP2), Both Inputs are CINnA, CINnB, CMPREF

and internal reference voltage, and outputs are CMP1 and CMP2 by setting OEn bit. After enable

Comparators the Comparator need waited stable time to guarantee Comparator output. If programmer

used internal reference voltage, it will be set OEn bit to “1”. The value of internal reference voltage

(Vref) is 1.19V +/- 10%.

CP1

(P0.4) CIN1A

(P0.3) CIN1B

(P0.5) CMPREF

Enable CMP1

CMP1 Analog Circuit

Comparator1

+

Vref

CO1

OE1

Change Detect

CMF1

-

CN1

CP2

CMP2 Analog Circuit

Comparator2

CMP1(P0.6)

CE1

CE2

En

Vref

Interrupt

Enable CMP2

(P0.2) CIN2A

(P0.1) CIN2B

+

-

CN2

CO2

OE2

Change Detect

CMF2

CMP2(P0.0)

Interrupt

Figure 19-1: Analog Comparators

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