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UPD17708 Datasheet(PDF) 236 Page - NEC

No. de pieza UPD17708
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD17708 Datasheet(HTML) 236 Page - NEC

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16.2.9 Serial I/O mode
(1) Outline of serial I/O mode
In the serial I/O mode, communication is carried out by using two pins, SCL and SDA, or three pins, SCK0,
SO0, and SI0.
(2) Timing chart
Figure 16-14 shows the timing chart in the serial I/O mode.
Figure 16-14. Timing Chart in Serial I/O Mode
Clock counter
0
1
2
6
7
8
0
1
Serial data
La
D7
D6
D5
D1
D0
D7
Shift clock
SIO0NWT
SIO0WSTT
SIO0SF8
SIO0SF9
“0”
SBSTT
“0”
SBBSY
“0”
<1>
<2> <3>
<4>
1
1
23
7
8
<5>
INT<6>
<7>
<1> Initial status (general-purpose input port)
<2> Sets transmission status of master
<3> Releases wait status
<4> Wait timing when data wait status is set
<5> Releases wait status again
<6> Issues interrupt request when value of clock counter is 7
<7> Issues interrupt request when value of clock counter is 8



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