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UPD780138 Datasheet(PDF) 90 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) 90 Page - NEC

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User’s Manual U16228EJ2V0UD
90
CHAPTER 4 PORT FUNCTIONS
4.1 Port Functions
There are two types of pin I/O buffer power supplies: AVREF and EVDD. The relationship between these power
supplies and the pins is shown below.
Table 4-1. Pin I/O Buffer Power Supplies
Power Supply
Corresponding Pins
AVREF
P20 to P27
EVDD
Port pins other than P20 to P27
78K0/KE1 products are provided with the ports shown in Figure 4-1, which enable variety of control operations.
The functions of each port are shown in Table 4-2.
In addition to the function as digital I/O ports, these ports have several alternate functions. For details of the
alternate functions, refer to CHAPTER 2 PIN FUNCTIONS.
Figure 4-1. Port Types
Port 2
P20
P27
Port 3
P30
P33
Port 5
P50
P53
Port 0
P00
P06
Port 1
P10
P17
Port 4
P40
P43
Port 6
P60
P63
Port 7
P70
P77
P120
Port 12
Port 14
P140
P141
P130
Port 13


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