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7220 Datasheet(PDF) 205 Page - Renesas Technology Corp

Part # 7220
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  303 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7220 Datasheet(HTML) 205 Page - Renesas Technology Corp

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5-32
APPLICATION
5.5 Example of I2C-BUS control by software (M37220M3-XXXSP/FP)
7220 Group User’s Manual
(7)
Data input processing routine
Fig. 5.5.10 Flowchart of data input processing routine
Data intput
Bit 0 of port P2 direction register
=
“input mode”
“BIT COUNTER” = “0”
P20 (SDA) = “1”?
RETURN
Yes
RAM: READDATA
BIT COUNTER
Carry flag = “1”
No
No
“BIT COUNTER”
≥ “8”?
Carry flag = “0”
Rotate “READDATA”
with Carry flag, to left
P21 (SCL) = “1”
“BIT COUNTER”
←“BIT COUNTER” + 1
Yes
P21 (SCL) = “1”
Wait 6
µs



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