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38K2 Datasheet(PDF) 197 Page - Renesas Technology Corp

Part # 38K2
Description  RENESAS 8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES
PDF  358 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

38K2 Datasheet(HTML) 197 Page - Renesas Technology Corp

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2.4 Serial I/O
Rev.2.00
Oct 15, 2006
page 48 of 112
38K2 Group
REJ09B0338-0200
APPLICATION
2.4.5 Serial I/O application examples
(1)
Communication using clock synchronous serial I/O (transmit/receive)
Outline : 2-byte data is transmitted and received, using the clock synchronous serial I/O.
________
The SRDY signal is used for communication control.
Figure 2.4.13 shows a connection diagram, and Figure 2.4.14 shows a timing chart.
Figure 2.4.15 shows a registers setting related to the transmitting side, and Figure 2.4.16 shows
registers setting related to the receiving side.
Fig. 2.4.13 Connection diagram
Specifications : • The Serial I/O is used (clock synchronous serial I/O is selected.)
• Synchronous clock frequency : 125 kHz (f(XIN) = 6 MHz is divided by 48)
• The SRDY (receivable signal) is used.
• The receiving side outputs the SRDY signal at intervals of 2 ms (generated by timer),
and 2-byte data is transferred from the transmitting side to the receiving side.
Fig. 2.4.14 Timing chart
P52
/INT1
SCLK
TXD
38K2 group
SRDY
SCLK
RXD
38K2 group
Transmitting side
Receiving side
• • • •
D0
D4
D2
D1
D6
D5
D7
D3
D0
D4
D2
D1
D6
D5
D7
D3
D0
D1
• • • •
• • • •
TXD
SCLK
SRDY
2 ms



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