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W921E880 Datasheet Preview

W921E880 Datasheet

4-BIT MICROCONTROLLER

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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 03......................................................................................................................................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




Winbond

W921E880 Datasheet Preview

W921E880 Datasheet

4-BIT MICROCONTROLLER

No Preview Available !

W921E880A/W921C880
7. ADDRESSING MODE ..............................................................................................................................40
7.1 ROM Addressing Mode ..................................................................................................................40
7.2 RAM Addressing Mode...................................................................................................................40
7.3 Look-up Table Addressing Mode (1 Word/2 Cycles) ......................................................................42
8. SPECIAL CONTROL REG. FORMAT ......................................................................................................43
9. INSTRUCTION MAP.................................................................................................................................45
10. INSTRUCTION SETS .............................................................................................................................48
11. ABSOLUTE MAXIMUM RATINGS .........................................................................................................51
12. ELECTRICAL CHARACTERISTICS.......................................................................................................52
12.1 AC Characteristics ........................................................................................................................52
12.2 DC Characteristics........................................................................................................................54
13. PACKAGE DIMENSIONS.......................................................................................................................56
80-pin QFP ............................................................................................................................................56
-2-


Part Number W921E880
Description 4-BIT MICROCONTROLLER
Maker Winbond
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W921E880 Datasheet PDF





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