W921C840 Просмотр технического описания (PDF) - Winbond

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Компоненты Описание

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W921C840

4-BIT MICROCONTROLLER

Winbond 

W921E840A/W921C840

4-BIT MICROCONTROLLER

Table of Contents-

1. GENERAL DESCRIPTION .........................................................................................................................3

2. FEATURES.................................................................................................................................................3

3. PIN CONFIGURATIONS.............................................................................................................................6

40-pin DIP..................................................................................................................................................6

48-pin QFP.................................................................................................................................................7

4. PIN DESCRIPTION.....................................................................................................................................9

5. BLOCK DIAGRAM ....................................................................................................................................10

6. FUNCTIONAL DESCRIPTION .................................................................................................................11

6.1 ROM Memory Map ...........................................................................................................................11

6.2 RAM Memory Map............................................................................................................................12

6.2.1 Special Control Register Area .................................................................................................12

6.2.2 Stack Register Area ................................................................................................................14

6.2.3 Working Register Area............................................................................................................15

6.3 Internal Oscillator Circuit ...................................................................................................................15

6.4 Initial State ........................................................................................................................................16

6.5 Input/Output ......................................................................................................................................17

6.5.1 Normal/Special Function Selection of I/O ................................................................................17

6.5.2 Pull High and Open Drain Control of I/O .................................................................................19

6.6 Serial Port .........................................................................................................................................21

6.7 DTMF Generator...............................................................................................................................24

6.8 Beep Tone Generator .......................................................................................................................25

6.9 D/A Converter ...................................................................................................................................26

6.10 Comparator.....................................................................................................................................27

6.11 Timer/Counter .................................................................................................................................28

6.11.1 TM0......................................................................................................................................28

6.11.2 TM1......................................................................................................................................30

6.11.3 TM2......................................................................................................................................32

6.11.4 TM3......................................................................................................................................34

6.11.5 Arbitrary Waveform Generator ..............................................................................................35

Publication Release Date: July 1999

-1-

Revision A3

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