参数资料
型号: ADE7518ASTZF8-RL
厂商: Analog Devices Inc
文件页数: 120/128页
文件大小: 0K
描述: IC ENERGY METER MCU 8K 64LQFP
产品变化通告: Product Discontinuance 27/Oct/2011
标准包装: 1,500
输入阻抗: *
测量误差: *
电压 - 高输入/输出: *
电压 - 低输入/输出: *
电流 - 电源: *
电源电压: *
测量仪表类型: *
工作温度: *
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-LQFP(10x10)
包装: 带卷 (TR)
ADE7518
I 2 C RECEIVE AND TRANSMIT FIFOS
The I 2 C peripheral has a 4-byte receive FIFO and a 4-byte transmit
FIFO. The buffers reduce the overhead associated with using
the I 2 C peripheral. Figure 100 shows the operation of the I 2 C
receive and transmit FIFOs.
be generated after each byte is received or when the Rx FIFO
is full. If the peripheral is reading from a slave address, the
communication stops once the number of received bytes equals
the number set in I2CRCT, Bits [4:0]. An error, such as not
receiving an acknowledge, also causes the communication to
terminate.
The Tx FIFO can be loaded with four bytes to be transmitted to
CODE TO FILL Tx FIFO:
CODE TO READ Rx FIFO:
the slave at the beginning of a write operation. When the
transmit FIFO is empty, the I 2 C transmit interrupt flag is set,
and the PC vectors to the I 2 C interrupt vector if this interrupt is
enabled. If a new byte is not loaded into the Tx FIFO before it is
MOV
MOV
MOV
MOV
I 2 CTx,
I 2 CTx,
I 2 CTx,
I 2 CTx,
TxDATA1
TxDATA2
TxDATA3
TxDATA4
I 2 CTx
MOV A,
MOV A,
MOV A,
MOV A,
I 2 CRx;
I 2 CRx;
I 2 CRx;
I 2 CRx;
RESULT: A = RxDATA1
RESULT: A = RxDATA2
RESULT: A = RxDATA3
RESULT: A = RxDATA4
I 2 CRx
needed in the transmit shift register, the communication stops.
An error, such as not receiving an acknowledge, also causes the
communication to terminate. In case of an error during a write
operation, the Tx FIFO is flushed.
4-BYTE FIFO
TxDATA4
TxDATA3
TxDATA2
TxDATA1
4-BYTE FIFO
RxDATA1
RxDATA2
RxDATA3
RxDATA4
The Rx FIFO allows four bytes to be read in from the slave
before the MCU has to read the data. A receive interrupt can
Rev. 0 | Page 120 of 128
TRANSMIT SHIFT REGISTER RECEIVE SHIFT REGISTER
Figure 100. I 2 C FIFO Operation
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