7220 Datasheet, PDF (200/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
5.5 Example of I²C-BUS control by software (M37220M3-XXXSP/FP)
5.5.3 Single-chip color TV signal processor function
(1) Status read
Status is read by sending the START condition, slave address “BB16.” After ACK is generated from
the M52340SP, the status data is read out. After the status data is output, any acknowledge bit is
not generated, but the STOP condition is sent by the master. Then this read operation is completed.
S
N
Bus operation of
master side:
T
A
R
Slave
address
(R)
T
A
C
K
S
T
O
P
SDA signal S
R
P
A
Bus operation of
C
slave side:
K
S : START condition
P : STOP condition
ACK : Acknowledge bit
R : Read bit (1)
NACK : No acknowledge bit
Data (n)
Fig. 5.5.2 Staus read timing
(2) Byte write
Bytes are written by sending the START condition, slave address “BA16,” sub-address (1 byte), data
(1 byte), and the STOP condition from the master.
S
Bus operation of T
master side:
A
R
T
Slave
address (W)
Sub-address (n)
SDA signal S
W
Bus operation of
slave side:
A
A
C
C
K
K
S : START condition
P : STOP condition
ACK : Acknowledge bit
W : Write bit (0)
Fig. 5.5.3 Byte write timing
S
Data (n)
T
O
P
P
A
C
K
7220 Group User’s Manual
5-27