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7220 데이터시트(PDF) 202 Page - Renesas Technology Corp

부품명 7220
상세설명  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  303 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - 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
5-29
(2)
Read processing routine
Fig. 5.5.5 Flowchart of read processing routine
“WRITEDATA”
←Slave address (W) “A0 16”
“F_ACK” = “0”?
Data output
Data output
Yes (ACK)
Ž

“NO ACK COUNTER” = “0”
START condition
“WRITEDATA”
←Sub-address
“F_ACK” = “0”?
Yes (ACK)
No (no ACK)
No (no ACK)
Œ
Read start
RAM:
Flag:
WRITEDATA
NO ACK COUNTER
READ DATA COUNTER
F_ACK
S
Slave address
(W) “A016”
A
C
K
Sub-address
A
C
K
Data
N
A
C
K
P
Œ
Ž


R
S
Slave address
(R) “A116”
‘’
A
C
K
To M52340SP ?
(See note 2)
No (to other devices (cf. E 2PROM))
Yes (sub-address is not necessary at reading)
End
’
“READ DATA
COUNTER” = “0”?
Yes (end)
No (not yet)
Return NACK
STOP condition
Return ACK
“READ DATA COUNTER”
←“READ DATA COUNTER” – 1
Data input
‘
“
“NO ACK COUNTER”
←“NO ACK COUNTER” + 1
STOP condition
“NO ACK COUNTER”
≥ “3”?
Yes (give up)
No (try 3 times)
Data output

START condition

“WRITEDATA”
←Slave address (R) “A1 16”
“F_ACK” = “0”?
Yes (ACK)
No (no ACK)
“
Bus H
Notes 1: NACK = No ACK
Branches according to whether the
device needs sub-address or not.
(See note 1)
2:



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