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UPD78F9026A Datasheet(Folha de dados) 78 Page - NEC

Nome de Peças. UPD78F9026A
descrição  8-Bit Single-Chip Microcontrollers
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Fbricantes  NEC [NEC]
Página de início  http://www.nec.com/
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 78 page
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CHAPTER 4 PORT FUNCTIONS
User's Manual U11919EJ3V0UM00
78
4.2.6 Port 5
This is a 4-bit I/O port with output latch. Port 5 can be specified in the input or output mode in 1-bit units by using
the port mode register 5 (PM5). When using P50 to P53 pins as input port pins, on-chip pull-up resistors can be
connected in 4-bit units by using the pull-up resistor option register (PUO).
The pins of this port are also used as the data I/O pins of the timer.
RESET input sets port 5 to input mode.
Figures 4-9 through 4-11 show the block diagrams of port 5.
Figure 4-9. Block Diagram of P50
VDD0
P-ch
P50/TI0/TO0
WRPUO
RD
WRPORT
WRPM
PUO5
Alternate
Function
Output Latch
(P50)
PM50
Alternate
Function
PUO : Pull-up resistor option register
PM
: Port mode register
RD
: Port 5 read signal
WR : Port 5 write signal




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