AT89S2051 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89S2051

8-bit Microcontroller with 2K/4K Bytes Flash

Atmel Corporation 

AT89S2051/S4051

20. Analog Comparator Register

.

Table 20-1. ACSR – Analog Comparator Control & Status Register

ACSR = 97H

Not Bit Addressable

–

–

–

CF

CEN

Bit

7

6

5

4

3

Reset Value = XXX0 0000B

CM2

2

CM1

1

CM0

0

Symbol

CF

CEN

CM [2:0]

Function

Comparator Interrupt Flag. Set when the comparator output meets the conditions specified by the CM [2:0] bits and CEN

is set. The flag must be cleared by software. The interrupt may be enabled/disabled by setting/clearing bit 6 of IE.

Comparator Enable. Set this bit to enable the comparator. Clearing this bit will force the comparator output low and

prevent further events from setting CF.

Comparator Interrupt Mode

210

--- ---- ----

Interrupt Mode

---------------------------------------

000

Negative (Low) level

001

Positive edge

010

Toggle with debounce

011

Positive edge with debounce

100

Negative edge

101

Toggle

110

Negative edge with debounce

111

Positive (High) level

19

3390C–MICRO–7/05

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