Renesas H8S/2111B 用户手册

Rev. 1.00, 05/04, page 307 of 544 

 

The I

2

C bus interface has an I

2

C bus format and a serial format. 

The I

2

C bus format is an addressing format with an acknowledge bit. This is shown in figure 13.3. 

The first frame following a start condition always consists of 9 bits. 

The serial format is a non-addressing format with no acknowledge bit. This is shown in  
figure 13.4. 

Figure 13.5 shows the I

2

C bus timing. 

The symbols used in figures 13.3 to 13.5 are explained in table 13.6. 

S

A

SLA

7

n

R/

W

DATA

A

1

1

m

1

1

1

A/

A

1

P

1

Transfer bit count
(n = 1 to 8)
Transfer frame count
(m 

≥ 1)

S

SLA

7

n1

7

R/

W

A

DATA

1

1

1

m1

1

A/

A

1

S

1

SLA

R/

W

1

1

m2

A

1

DATA

n2

A/

A

1

P

1

(a) FS = 0 or FSX = 0

(b) Start condition retransmission FS = 0 or FSX = 0

Upper row: Transfer bit count (n1, n2 = 1 to 8)
Lower row: Transfer frame count (m1, m2 

≥ 1)

 

S

DATA

8

n

DATA

1

1

m

P

1

FS = 1 and FSX = 1

Transfer bit count
(n = 1 to 8)
Transfer frame count
(m 

≥ 1)