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參數(shù)資料
| 型號： | ST72774S9T1/XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 11/144頁 |
| 文件大?。?/td> | 1280K |
| 代理商： | ST72774S9T1/XXX |
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ST72774/ST727754/ST72734
108/144
DDC INTERFACE (Cont’d)
Slave Receiver
Following the address reception and after SR1
register has been read, the slave receives bytes
from the SDA line into the DR register via the
internal shift register. After each byte, the following
events occur in sequence:
– Acknowledge pulse is generated if the ACK bit is
set.
– EVF and BTF bits are set.
– An interrupt is generated if the ITE bit is set.
Then the interface waits for a read of the SR1
register followed by a read of the DR register,
holding the SCL line low (see Figure 67 Transfer
sequencing EV2).
Slave Transmitter
Following the address reception and after SR1
register has been read, the slave sends bytes from
the DR register to the SDA line via the internal shift
register.
The slave waits for a read of the SR1 register
followed by a write in the DR register, holding the
SCL line low (see Figure 67 Transfer sequencing
EV3).
When the acknowledge pulse is received:
– EVF and BTF bits are set.
– An interrupt is generated if the ITE bit is set.
Closing slave communication
After the last data byte is transferred, a Stop
Condition is generated by the master. The
interface detects this condition and in this case:
– EVF and STOPF bits are set.
– An interrupt is generated if the ITE bit is set.
Then the interface waits for a read of the SR2
register (see Figure 67 Transfer sequencing EV4).
Error Cases
– BERR: Detection of a Stop or a Start condition
during a byte transfer. In this case, the EVF and
the BERR bits are set and an interrupt is gener-
ated if the ITE bit is set.
If it is a Stop then the interface discards the data,
releases the lines and waits for another Start
condition.
If it is a Start then the interface discards the data
and waits for the next slave address on the bus.
– AF: Detection of a non-acknowledge bit. In this
case, the EVF and AF bits are set and an inter-
rupt is generated if the ITE bit is set.
Note:In both cases, SCL line is not held low; however,
SDA line can remain low due to possible 0 bits
transmitted last. It is then necessary to release both
lines by software.
How to release the SDA / SCL lines
Set and subsequently clear the STOP bit while
BTF is set. The SDA/SCL lines are released after
the transfer of the current byte.
Other Events
s
ADSL: Detection of a Start condition after an
acknowledge time-slot.
The state machine is reset and starts a new
process. The ADSL bit is set and an interrupt is
generated if the ITE bit is set. The SCL line is
stretched low.
s
STOPF: Detection of a Stop condition after an
acknowledge time-slot.
The state machine is reset. Then the STOPF
flag is set and an interrupt is generated if the ITE
bit is set.
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