Motor de Búsqueda de Datasheet de Componentes Electrónicos
Selected language     Spanish  ▼

Delete All
ON OFF
ALLDATASHEET.ES

X  

Preview PDF Download HTML

UPD780138 Datasheet(PDF) 44 Page - NEC

No. de Pieza. UPD780138
Descripción  8-Bit Single-Chip Microcontrollers
Descarga  558 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo 

UPD780138 Datasheet(HTML) 44 Page - NEC

Zoom Inzoom in Zoom Outzoom out
 44 / 558 page
background image
CHAPTER 2 PIN FUNCTIONS
User’s Manual U16228EJ2V0UD
44
2.2.14 RESET
This is the active-low system reset input pin.
2.2.15 REGC
This is the pin for connecting the capacitor for the regulator. When using the regulator, connect this pin to VSS via a
capacitor (1
µF: recommended). When the regulator is not used, connect this pin directly to VDD pin.
Caution
A regulator cannot be used with (A1) grade products and (A2) grade products.
Be sure to
connect the REGC pin of these products directly to VDD.
2.2.16 X1 and X2
These are the pins for connecting a resonator for X1 input clock.
When supplying an external clock, input a signal to the X1 pin and input the inverse signal to the X2 pin.
2.2.17 XT1 and XT2
These are the pins for connecting a resonator for subsystem clock.
When supplying an external clock, input a signal to the XT1 pin and input the inverse signal to the XT2 pin.
2.2.18 VDD and EVDD
VDD is the positive power supply pin for other than ports.
EVDD is the positive power supply pin for ports.
2.2.19 VSS and EVSS
VSS is the ground potential pin for other than ports.
EVSS is the ground potential pin for ports.
2.2.20 VPP (flash memory versions only)
This is a pin for flash memory programming mode setting and high-voltage application for program write/verify.
Connect to EVSS or VSS in the normal operation mode.
2.2.21 IC (mask ROM versions only)
The IC (Internally Connected) pin is provided to set the test mode to check the 78K0/KE1 at shipment. Connect it
directly to EVSS or VSS pin with the shortest possible wire in the normal operation mode.
When a potential difference is produced between the IC pin and the EVSS or VSS pin because the wiring between
these two pins is too long or external noise is input to the IC pin, the user’s program may not operate normally.
• Connect the IC pin directly to EVSS or VSS.
As short as possible
IC
EVSS or VSS


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96  97  98  99  100   ...More


Datasheet Download




Enlace URL




Privacy Policy
ALLDATASHEET.ES
Does ALLDATASHEET help your business so far?  [ DONATE ]  

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Favorito   |   Intercambio de Enlaces   |   Lista de Fabricantes
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn