W921C880 Просмотр технического описания (PDF) - Winbond

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Компоненты Описание

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W921C880

4-BIT MICROCONTROLLER

Winbond 

W921E880A/W921C880

4-BIT MICROCONTROLLER

Table of Contents-

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

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

3. PIN CONFIGURATION ...............................................................................................................................6

4. PIN DESCRIPTION.....................................................................................................................................7

5. BLOCK DIAGRAM ......................................................................................................................................9

6. FUNCTIONAL DESCRIPTION .................................................................................................................10

6.1 ROM Memory Map .........................................................................................................................10

6.2 RAM Memory Map..........................................................................................................................11

6.2.1 Special Control Reg. Area..................................................................................................11

6.2.2 Stack Reg. Area.................................................................................................................12

6.2.3 Working Reg. Area ............................................................................................................12

6.3 Internal Oscillator Circuit .................................................................................................................13

6.4 Initial State ......................................................................................................................................14

6.5 Input/Output ....................................................................................................................................14

6.5.1 I/O Pull High and Open Drain Control.................................................................................17

6.6 Serial Port.......................................................................................................................................19

6.7 DTMF Generator.............................................................................................................................21

6.8 Beep Tone Generator.....................................................................................................................22

6.9 8-bit D/A Converter.........................................................................................................................23

6.10 Comparator...................................................................................................................................24

6.11 Timer 0−3......................................................................................................................................25

6.11.1 Arbitrary Waveform Generator.........................................................................................32

6.12 Interrupt.........................................................................................................................................33

6.12.1 Interrupt Control Register ..................................................................................................33

6.12.2 Interrupt Enable Flag........................................................................................................34

6.13 Operating Mode............................................................................................................................34

6.14 Initial Condition Register of EPROM Program Method .................................................................39

6.15 Reset ............................................................................................................................................39

Publication Release Date: July 1999

-1-

Revision A3

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