参数资料
型号: L64781
厂商: LSI CORP
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封装: PLASTIC, QFP-100
文件页数: 104/164页
文件大小: 2003K
代理商: L64781
3-4
Interfaces
Step 12. The master does not generate an acknowledge during the ACK
cycle.
Step 13. The master terminates the cycle by issuing a stop condition.
Figure 3.4
Single Read from Slave with Repeat-Start Condition
3.1.1.2 Multiread Cycle
It is possible to read data at consecutive addresses during a cycle
without explicitly sending each address by implementing an
“autoincrement” in the block.
A multiread cycle starts like a normal read cycle, in which the master
sends a register address of register, Ad, and waits for the contents sent
back by the slave data(Ad). However, instead of issuing a stop condition,
it waits for new data, which is understood as being data(Ad+1). It
continues, data(Ad + 2), data(Ad + 3)..., data(Ad + n), until all addresses
are read, then the master issues a stop condition.
The multiread cycle has two variations:
Without a repeat-start condition
With a repeat-start condition
Multiread Cycle without Repeat Start Condition – The steps in a
Multiread cycle with no repeat-start condition, Figure 3.5, are:
Step 1.
The master starts the cycle by issuing a start condition.
Step 2.
The master transmits the 7-bit slave address.
8-Bit Address
7-Bit Slave Address
8-Bit Data
ACKn
Slave
Master
ACKn
Stop
R/Wn
ACKn
Slave
ACKn
Slave
7-Bit Slave Address
R/Wn
SCL
SDA
Step 1
Step 2
Step 3 Step 4
Step 5
Step 6
Step 7
Step 8
Step 9 Step 10 Step 11 Step 12 Step 13
Condition
Repeat Start
Condition
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2
Bit 1 Bit 0
Start
Condition
l64781.book Page 4 Friday, January 19, 2001 1:28 PM
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