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PDF UPD78F941xA Data sheet ( Hoja de datos )

Número de pieza UPD78F941xA
Descripción (UPD78F94xxA) 8 Bit Single-Chip MicroController
Fabricantes NEC 
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No Preview Available ! UPD78F941xA Hoja de datos, Descripción, Manual

User’s Manual
µPD789407A, 789417A
Subseries
8-Bit Single-Chip Microcontrollers
µPD789405A
µPD789406A
µPD789407A
µPD789415A
µPD789416A
µPD789417A
µPD78F9418A
Document No. U13952EJ3V0UD00 (3rd edition)
Date Published April 2003 N CP(K)
Printed in Japan
1999, 2003

1 page




UPD78F941xA pdf
Regional Information
Some information contained in this document may vary from country to country. Before using any NEC
Electronics product in your application, pIease contact the NEC Electronics office in your country to
obtain a list of authorized representatives and distributors. They will verify:
Device availability
Ordering information
Product release schedule
Availability of related technical literature
Development environment specifications (for example, specifications for third-party tools and
components, host computers, power plugs, AC supply voltages, and so forth)
Network requirements
In addition, trademarks, registered trademarks, export restrictions, and other legal issues may also vary
from country to country.
NEC Electronics America, Inc. (U.S.)
Santa Clara, California
Tel: 408-588-6000
800-366-9782
Fax: 408-588-6130
800-729-9288
NEC Electronics (Europe) GmbH
Duesseldorf, Germany
Tel: 0211-65 03 01
Fax: 0211-65 03 327
Sucursal en España
Madrid, Spain
Tel: 091-504 27 87
Fax: 091-504 28 60
Succursale Française
Vélizy-Villacoublay, France
Tel: 01-30-67 58 00
Fax: 01-30-67 58 99
Filiale Italiana
Milano, Italy
Tel: 02-66 75 41
Fax: 02-66 75 42 99
Branch The Netherlands
Eindhoven, The Netherlands
Tel: 040-244 58 45
Fax: 040-244 45 80
Tyskland Filial
Taeby, Sweden
Tel: 08-63 80 820
Fax: 08-63 80 388
United Kingdom Branch
Milton Keynes, UK
Tel: 01908-691-133
Fax: 01908-670-290
NEC Electronics Hong Kong Ltd.
Hong Kong
Tel: 2886-9318
Fax: 2886-9022/9044
NEC Electronics Hong Kong Ltd.
Seoul Branch
Seoul, Korea
Tel: 02-528-0303
Fax: 02-528-4411
NEC Electronics Shanghai, Ltd.
Shanghai, P.R. China
Tel: 021-6841-1138
Fax: 021-6841-1137
NEC Electronics Taiwan Ltd.
Taipei, Taiwan
Tel: 02-2719-2377
Fax: 02-2719-5951
NEC Electronics Singapore Pte. Ltd.
Novena Square, Singapore
Tel: 6253-8311
Fax: 6250-3583
Users Manual U13952EJ3V0UD
J02.11
5

5 Page





UPD78F941xA arduino
3.2.2 General-purpose registers ................................................................................................................ 57
3.2.3 Special function registers (SFR) ....................................................................................................... 58
3.3 Instruction Address Addressing................................................................................................. 61
3.3.1 Relative addressing .......................................................................................................................... 61
3.3.2 Immediate addressing....................................................................................................................... 62
3.3.3 Table indirect addressing.................................................................................................................. 63
3.3.4 Register addressing.......................................................................................................................... 63
3.4 Operand Address Addressing..................................................................................................... 64
3.4.1 Direct addressing.............................................................................................................................. 64
3.4.2 Short direct addressing..................................................................................................................... 65
3.4.3 Special function register (SFR) addressing ...................................................................................... 66
3.4.4 Register addressing.......................................................................................................................... 67
3.4.5 Register indirect addressing ............................................................................................................. 68
3.4.6 Based addressing ............................................................................................................................. 69
3.4.7 Stack addressing .............................................................................................................................. 69
CHAPTER 4 PORT FUNCTIONS ........................................................................................................... 70
4.1 Function of Port ............................................................................................................................ 70
4.2 Configuration of Ports ................................................................................................................. 72
4.2.1 Port 0 ................................................................................................................................................ 72
4.2.2 Port 2 ................................................................................................................................................ 73
4.2.3 Port 4 ................................................................................................................................................ 78
4.2.4 Port 5 ................................................................................................................................................ 80
4.2.5 Port 6 ................................................................................................................................................ 81
4.2.6 Port 8 ................................................................................................................................................ 83
4.2.7 Port 9 ................................................................................................................................................ 84
4.3 Registers Controlling Ports ......................................................................................................... 85
4.4 Operation of Ports ........................................................................................................................ 88
4.4.1 Writing to I/O port.............................................................................................................................. 88
4.4.2 Reading from I/O port ....................................................................................................................... 88
4.4.3 Arithmetic operation of I/O port ......................................................................................................... 88
CHAPTER 5 CLOCK GENERATOR ...................................................................................................... 89
5.1 Functions of Clock Generator ..................................................................................................... 89
5.2 Configuration of Clock Generator............................................................................................... 89
5.3 Registers Controlling Clock Generator ...................................................................................... 91
5.4 System Clock Oscillators............................................................................................................. 94
5.4.1 Main system clock oscillator ............................................................................................................. 94
5.4.2 Subsystem clock oscillator................................................................................................................ 95
5.4.3 Examples of incorrect resonator connection..................................................................................... 96
5.4.4 Divider............................................................................................................................................... 97
5.4.5 When no subsystem clock is used.................................................................................................... 97
5.5 Operation of Clock Generator ..................................................................................................... 98
5.6 Changing Setting of System Clock and CPU Clock .................................................................. 99
5.6.1 Time required for switching between system clock and CPU clock.................................................. 99
5.6.2 Switching between system clock and CPU clock............................................................................ 100
User’s Manual U13952EJ3V0UD
11

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