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W921E400 Datasheet Preview

W921E400 Datasheet

4-BIT MICROCONTROLLER

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W921E400A/W921C400
4-BIT MICROCONTROLLER
Table of Contents-
1. GENERAL DESCRIPTION .........................................................................................................................3
2. FEATURES.................................................................................................................................................3
3. PIN CONFIGURATION ...............................................................................................................................5
4. PIN DESCRIPTION.....................................................................................................................................6
5. BLOCK DIAGRAM ......................................................................................................................................7
6. FUNCTION DESCRIPTION........................................................................................................................8
6.1 ROM Memory Map ..............................................................................................................................8
6.2 RAM Memory Map...............................................................................................................................9
6.2.1 Special Control Register Area ....................................................................................................9
6.2.2 Stack Register Area .................................................................................................................11
6.2.3 Working Register Area.............................................................................................................12
6.3 Internal Oscillator Circuit.....................................................................................................................12
6.4 Initial State .........................................................................................................................................13
6.5 Input/Output........................................................................................................................................13
6.5.1 Normal/Special function selection of I/O...................................................................................14
6.5.2 Pull High and Open Drain Control of I/O ..................................................................................15
6.6 Serial Port ..........................................................................................................................................18
6.7 DTMF Generator................................................................................................................................20
6.8 Beep Tone Generator ........................................................................................................................22
6.9 Comparator........................................................................................................................................22
6.10 Timer/Counter ..................................................................................................................................24
6.10.1 TM0.......................................................................................................................................24
6.10.2 TM2.......................................................................................................................................26
6.10.3 TM3.......................................................................................................................................28
6.10.4 Arbitrary Waveform Generator ...............................................................................................29
6.11 Interrupt............................................................................................................................................30
6.11.1 Interrupt Control Register.......................................................................................................30
6.11.2 Interrupt Enable Flag .............................................................................................................31
Publication Release Date: July 1998
- 1 - Revision A3




Winbond

W921E400 Datasheet Preview

W921E400 Datasheet

4-BIT MICROCONTROLLER

No Preview Available !

W921E400A/W921C400
6.12 Operating Mode ...............................................................................................................................31
6.12.1 Normal Mode: ........................................................................................................................31
6.12.2 Hold Mode: ............................................................................................................................31
6.12.3 Stop Mode: ............................................................................................................................34
6.13 Initial Condition Register of EPROM Program Method .....................................................................36
6.14 Reset.................................................................................................................................................36
6.14.1 Reset by RESET .....................................................................................................................36
6.14.2 Reset by Watch Dog Timer .....................................................................................................36
7. ABSOLUTION MAXIMUM RATINGS .......................................................................................................37
8. ELECTRICAL CHARACTERISTICS.........................................................................................................37
8.1 DC Characteristics .............................................................................................................................37
8.2 AC Characteristics .............................................................................................................................40
9. ADDRESSING MODE ..............................................................................................................................42
9.1 ROM Addressing Mode......................................................................................................................42
9.1.1 Indirect Call Addressing Mode: (1 word/2 cycles) .....................................................................42
9.1.2 Long Call/Jump Addressing Mode: (2 words/2 cycles)..............................................................42
9.2 RAM Addressing Mode ......................................................................................................................42
9.2.1 Direct Addressing Mode: (2 words/2 cycles) .............................................................................43
9.2.2 Indirect Addressing Mode: (1 word / 1 cycle) ............................................................................43
9.2.3 Working Register Addressing Mode: (1 word / 1 cycle).............................................................43
9.3 Look-up Table Addressing Mode (1 word/2 cycles) ...........................................................................43
10. INSTRUCTION CODE MAP ...................................................................................................................45
11. INSTRUCTION SET SUMMARY ............................................................................................................48
12. PACKAGE DIMENSIONS........................................................................................................................52
28-pin DIP .................................................................................................................................................52
28-pin SOP ...............................................................................................................................................52
-2-


Part Number W921E400
Description 4-BIT MICROCONTROLLER
Maker Winbond
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W921E400 Datasheet PDF






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