W921E840A Datasheet, PDF (2/58 Pages) Winbond – 4-BIT MICROCONTROLLER

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
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