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UPD780138 Datasheet(PDF) 39 Page - NEC

No. de Pieza. UPD780138
Descripción  8-Bit Single-Chip Microcontrollers
Descarga  558 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD780138 Datasheet(HTML) 39 Page - NEC

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CHAPTER 2 PIN FUNCTIONS
User’s Manual U16228EJ2V0UD
39
(2) Non-port pins (2/2)
Pin Name
I/O
Function
After Reset
Alternate Function
AVREF
Input
A/D converter reference voltage input and positive power
supply for port 2
AVSS
A/D converter ground potential. Make the same potential as
EVSS or VSS.
KR0 to KR7
Input
Key interrupt input
Input
P70 to P77
REGC
Connecting regulator output stabilization capacitor. When
using the regulator, connect to VSS via a capacitor (1
µF:
recommended). When the regulator is not used, connect
directly to VDD.
RESET
Input
System reset input
X1
Input
X2
Connecting resonator for X1 input clock
XT1
Input
XT2
Connecting resonator for subsystem clock
VDD
Positive power supply (except for ports)
EVDD
Positive power supply for ports
VSS
Ground potential (except for ports)
EVSS
Ground potential for ports
IC
Internally connected. Connect directly to EVSS or VSS.
VPP
Flash memory programming mode setting. High-voltage
application for program write/verify. Connect to EVSS or VSS in
normal operation mode.


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