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UPD78F9026A Folha de dados(PDF) 71 Page - NEC

Nome de Peças UPD78F9026A
Descrição Electrónicos  8-Bit Single-Chip Microcontrollers
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Fabricante Electrônico  NEC [NEC]
Página de início  http://www.nec.com/
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UPD78F9026A Folha de dados(HTML) 71 Page - NEC

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CHAPTER 4 PORT FUNCTIONS
User's Manual U11919EJ3V0UM00
71
4.2 Port Configuration
Ports have the following hardware configuration.
Table 4-2. Port Configuration
Parameter
Configuration
Control register
Port mode register (PMm: m = 0 to 5)
Pull-up resistor option register (PUO)
Port
Total: 34 (input/output: 34)
Pull-up resistor
Total: 34 (on-chip pull-up resistor can be connected by software)
4.2.1 Port 0
This is an 8-bit I/O port with output latch. Port 0 can be specified in the input or output mode in 1-bit units by
using the port mode register 0 (PM0). When using P00 to P07 pins as input port pins, on-chip pull-up resistors can
be connected in 8-bit units by using the pull-up resistor option register (PUO).
RESET input sets port 0 to input mode.
Figure 4-2 shows the block diagram of port 0.
Figure 4-2. Block Diagram of P00 to P07
WRPUO
RD
WRPORT
WRPM
Output Latch
(P00 to P07)
PM00 to PM07
PUO0
VDD0
P-ch
P00 to P07
PUO : Pull-up resistor option register
PM
: Port mode register
RD
: Port 0 read signal
WR : Port 0 write signal


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