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| 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)： | 10/144頁 |
| 文件大小： | 1280K |
| 代理商： | ST72774S9T1/XXX |
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ST72774/ST727754/ST72734
107/144
DDC INTERFACE (Cont’d)
4.8.5.2 DDC/CI - Factory Alignment Interface
4.8.5.2.1 Functional Description
Refer to the CR, SR1 and SR2 registers in Section
4.8.6. for the bit definitions.
The DDC/CI interface works as an I/O interface
between the microcontroller and the DDC2Bi,
EDDC or Factory alignment protocols. It receives
and transmits data in Slave I2C mode using an
interrupt or polled handshaking.
The interface is connected to the I2C bus by a data
pin (SDAD) and a clock pin (SCLD) configured as
open drain.
The DDC/CI interface has five internal register
locations.
Two of them are used for initialization of the
interface:
– Own Address Register OAR
– Control register CR
The following four registers are used during data
transmission/reception:
– Data Register DR
– Control Register CR
– Status Register 1 SR1
– Status Register 2 SR2
The interface decodes an I2C or DDC2Bi address
stored by software in the OAR register and/or the
EDDC address (60h/61h) as its default hardware
address.
After a reset, the interface is disabled.
4.8.5.2.2 I2C Modes
s
General description
In I2C mode, the interface can operate in the
following modes:
– Slave transmitter/receiver
Both start and stop conditions are generated by
the master. The I2C clock (SCL) is always
received by the interface from a master, but the
interface is able to stretch the clock line.
The interface is capable of recognizing both its
own programmable address (7-bit) and its default
hardware address (Enhanced DDC address: 60h/
61h). The Enhanced DDC address detection may
be enabled or disabled by software. It never
recognizes the Start byte (01h) whatever its own
address is.
s
Slave Mode
As soon as a start condition is detected, the
address is received from the SDA line and sent to
the shift register; then it is compared with the
programmable address of the interface or the
Enhanced DDC address (if selected by software).
Address not matched: the interface ignores it
and waits for another Start condition.
Address matched: the following events occur in
sequence:
– Acknowledge pulse is generated if the ACK bit is
set.
– EVF and ADSL bits are set.
– An interrupt is generated if the ITE bit is set.
Then the interface waits for a read of the SR1
register, holding the SCL line low (see Figure 67
Transfer sequencing EV1).
Next, the DR register must be read to determine
from the least significant bit if the slave must enter
Receiver or Transmitter mode.
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