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7540 Datasheet(PDF) 185 Page - Renesas Technology Corp

Part # 7540
Description  8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES
PDF  366 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7540 Datasheet(HTML) 185 Page - Renesas Technology Corp

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2-109
REJ09B0018-0200Z
Rev.2.00
Jun 21, 2004
7540 Group
APPLICATION
2.6 Serial I/O1
(3) Communication using clock synchronous serial I/O1 (transmit/receive)
Outline : 2-byte data is transmitted and received, using the clock synchronous serial I/O1. SRDY1
signal is used for communication control.
Specifications : •The serial I/O1 (clock synchronous serial I/O selected ) is used.
•Synchronous clock frequency : 125 kHz; f(XIN) = 4 MHz divided by 32
•The receiver outputs the SRDY1 signal at 2 ms intervals which the timer generates,
and 2-byte data is transferred from the transmitter to the receiver.
Figure 2.6.12 shows a connection diagram, Figure 2.6.13 shows a timing chart, Figure 2.6.14 shows
the control procedure of transmitter, and Figure 2.6.15 shows an example of control procedure of
receiver.
Fig. 2.6.12 Connection diagram
Fig. 2.6.13 Timing chart
SRDY1
SCLK1
TXD
D0
D1 D2 D3
D4 D5 D6
D7
D0 D1 D2
D3 D4 D5
D6
D7
D0 D1
2ms
.....
.....
.....
Transmitter
P37/INT0
SCLK1
TXD1
7540 Group
SRDY1
SCLK1
RXD1
Receiver
7540 Group



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