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7477 Datasheet(PDF) 261 Page - Renesas Technology Corp

Part # 7477
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  354 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 Datasheet(HTML) 261 Page - Renesas Technology Corp

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7470/7471/7477/7478 GROUP USER’S MANUAL
2-26
APPLICATION
2.4 Serial I/O
7470
7471
7477
7478
(2)Byte specification mode
Outline: Among the 7470/7471 group, transfer is performed for two or more microcomputers by
using the clock synchronous byte specification mode.
Specifications: Transmit side M3747x
1
• Synchronous clock: f(XIN)/32
• Port P17 is used as an SRDY signal input pin.
• Port P10 is used as an transmit preparation command signal output pin.
Receive side M3747x
2 , M3747x3 , M3747x4
• Synchronous clock: External clock
• SARDY signal output
• Port P10 is used as an transmit preparation command signal output pin.
Figure 2.4.4 shows an example of connections and Figure 2.4.5 and 2.4.6 show an example of
control procedure.
Fig. 2.4.4 Example of connections [Byte specification mode, 7470/7471 group]
,,
××
0
0
00
11
1
0
P17
CLK
SOUT
P10
11
1
1
10
0
0
CLK
SIN
P10
SRDY(SARDY)
11
1
1
10
0
0
CLK
SIN
P10
1
1
11
10
0
0
CLK
SIN
P10
SARDY
CLK
SRDY(SARDY)
SRDY(SARDY)
Transmit side (M3747x
1)
Serial I/O mode register
• Set port P17 as an input
• Connect a pull-up transistor to port P1 7
• Set port P10 as an output
(Port P10: Transmit preparation
command signal)
Serial I/O mode register
Serial I/O mode register
Serial I/O mode register
Receive side 1 (M3747x
2)
Receive side 2 (M3747x
3)
Receive side 3 (M3747x
4)
Byte counter (Initial value) = 0
Byte counter (Initial value) = 1
Byte counter (Initial value) = 2
Serial data
Transmit/receive preparation command signal
• Set port P10 as an input
(Port P10: Transmit/receive preparation
command signal)
• Set port P14 as an input
• Set port P10 as an input
(Port P10: Transmit/receive preparation
command signal)
• Set port P14 as an input
• Set port P10 as an input
(Port P10: Transmit/receive preparation
command signal)
• Set port P14 as an input



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