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7220 Datasheet(PDF) 206 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) 206 Page - Renesas Technology Corp

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APPLICATION
5.5 Example of I2C-BUS control by software (M37220M3-XXXSP/FP)
7220 Group User’s Manual
5-33
(8)
Return ACK processing routine
Fig. 5.5.11 Flowchart of return ACK processing routine
(9)
Return NACK processing routine
Fig. 5.5.12 Flowchart of return NACK processing routine
Return ACK
Bit 0 of port P2 direction register
= “output mode”
P20 (SDA) = “0”
Wait 6
µs
P21 (SCL) = “1”
Wait 6
µs
P21 (SCL) = “0”
RETURN
Return NACK
Bit 0 of port P2 direction register
= “output mode”
P20 (SDA) = “1”
Wait 6
µs
P21 (SCL) = “1”
Wait 6
µs
P21 (SCL) = “0”
RETURN



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