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W921E840 Datasheet Preview

W921E840 Datasheet

4-BIT MICROCONTROLLER

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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




Winbond

W921E840 Datasheet Preview

W921E840 Datasheet

4-BIT MICROCONTROLLER

No Preview Available !

W921E840A/W921C840
6.12 Interrupt...........................................................................................................................................35
6.12.1 Interrupt Control Register......................................................................................................35
6.12.2 Interrupt Enable Flag ............................................................................................................36
6.13 Operating Mode ..............................................................................................................................37
6.13.1 Normal Mode........................................................................................................................37
6.13.2 Hold Mode ............................................................................................................................37
6.13.3 Stop Mode ............................................................................................................................39
6.14 Initial Condition Register of EPROM Program Method ....................................................................41
6.15 Reset ..............................................................................................................................................41
6.15.1 Reset by RESET ...................................................................................................................41
6.15.2 Reset by Watch Dog Timer ...................................................................................................41
7. ABSOLUTION MAXIMUM RATINGS .......................................................................................................42
8. ELECTRICAL CHARACTERISTICS.........................................................................................................42
8.1 DC Characteristics ............................................................................................................................42
8.2 AC Characteristics ............................................................................................................................45
9. ADDRESSING MODE ..............................................................................................................................47
9.1 ROM Addressing Mode.....................................................................................................................47
9.1.1 Indirect Call Addressing Mode: (1 word/2 cycles) ....................................................................47
9.1.2 Long Call/Jump Addressing Mode: (2 words/2 cycles).............................................................47
9.2 RAM Addressing Mode .....................................................................................................................47
9.2.1 Direct Addressing Mode: (2 words/2 cycles) ............................................................................48
9.2.2 Indirect Addressing Mode: (1 word/1 cycle) .............................................................................48
9.2.3 Working Register Addressing Mode: (1 word/1 cycle)..............................................................48
9.3 Look-up Table Addressing Mode (1 word/2 cycles) ..........................................................................48
10. INSTRUCTION CODE MAP ...................................................................................................................50
11. INSTRUCTION SET SUMMARY ............................................................................................................53
12. PACKAGE DIMENSIONS.......................................................................................................................57
40-pin DIP................................................................................................................................................57
48-pin QFP...............................................................................................................................................57
-2-


Part Number W921E840
Description 4-BIT MICROCONTROLLER
Maker Winbond
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W921E840 Datasheet PDF






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