參數(shù)資料
型號: PIC14000
廠商: Microchip Technology Inc.
英文描述: CTV 22C 22#22D SKT RECP
中文描述: 28引腳可編程混合信號控制器
文件頁數(shù): 46/152頁
文件大?。?/td> 953K
代理商: PIC14000
PIC14000
DS40122B-page 46
Preliminary
1996 Microchip Technology Inc.
When a master does not wish to relinquish the bus (by
generating a STOP condition), a repeated START (Sr)
must be generated. This condition is identical to the
START (SDA goes high-to-low while SCL is high), but
occurs after a data transfer acknowledge pulse (not the
bus-free state). This allows a master to send
“commands” to the slave and then receive the
requested information or to address a different slave
device. This sequence is shown in Figure 7-10.
FIGURE 7-8:
MASTER - TRANSMITTER SEQUENCE
FIGURE 7-9:
MASTER - RECEIVER SEQUENCE
FIGURE 7-10: COMBINED FORMAT
For 7-bit address:
S Slave Address R/W A DATA A DATA A/A
P
"0" (write)
data transferred
(n bytes - acknowledge)
A master transmitter addresses a slave receiver with a
7-bit address. The transfer direction is not changed.
For 10-bit address:
S Slave Address
first 7 bits
R/W A1Slave Address
second byte
A2
(write)
A master transmitter addresses a slave receiver with a
10-bit address.
From master to slave
From slave to master
A = acknowledge (SDA low)
A = not acknowledge (SDA high)
S = START condition
P = STOP condition
Data A
Data
P
A/A
For 7-bit address:
S Slave Address R/W A DATA A DATA
A
P
(read)
data transferred
(n bytes - acknowledge)
A master reads a slave immediately after the first byte.
For 10-bit address:
S Slave Address
first 7 bits
R/W A1Slave Address
second byte
A2
(write)
A master transmitter addresses a slave receiver with a
10-bit address.
From master to slave
From slave to master
A = acknowledge (SDA low)
A = not acknowledge (SDA high)
S = START condition
P = STOP condition
Sr Slave Address
first 7 bits
R/W A3 Data A
Data
P
A
(read)
S Slave Address R/W A DATA A/A
(read or write)
(n bytes + acknowledge)
Transfer direction of data and acknowledgement bits depends on R/W bits.
Combined Format:
S Slave Address
first 7 bits
R/W A Slave Address
second byte
A
(write)
Combined format -
From master to slave
From slave to master
A = acknowledge (SDA low)
A = not acknowledge (SDA high)
S = START condition
P = STOP condition
Sr Slave Address
first 7 bits
R/W A Data A
Data
P
A
(read)
Sr Slave Address R/W A DATA A/A P
Sr = repeated
START condition
Direction of transfer
may change at this point
Data A
Data A/A
A master addresses a slave with a 10-bit address, then transmits
data to this slave and reads data from this slave.
(read)
(write)
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