參數(shù)資料
型號: ADE7878ACPZ
廠商: ANALOG DEVICES INC
元件分類: 模擬信號調(diào)理
英文描述: Poly Phase Multifunction Energy Metering IC With Total And Fundamental Powers, No Of Pins: 40, Temperature Range: Ind
中文描述: SPECIALTY ANALOG CIRCUIT, QCC40
封裝: 6 X 6 MM, ROHS COMPLIANT, MO-220WJJD, LFCSP-40
文件頁數(shù): 66/96頁
文件大?。?/td> 1096K
代理商: ADE7878ACPZ
ADE7854/ADE7858/ADE7868/ADE7878
Rev. E | Page 69 of 96
SPI Write Operation
The write operation using the SPI interface of the ADE78xx
initiates when the master sets the SS/HSA pin low and begins
sending one byte representing the address of the ADE7854/
ADE7858/ADE7868/ADE7878 on the MOSI line. The master
sets data on the MOSI line starting with the first high-to-low
transition of SCLK. The SPI of the ADE78xx samples data on
the low-to-high transitions of SCLK. The most significant seven
bits of the address byte can have any value, but as a good pro-
gramming practice, they should be different from 0111000b, the
seven bits used in the I2C protocol. Bit 0 (read/write) of the
address byte must be 0 for a write operation. Next, the master
sends both the 16-bit address of the register that is written and
the 32-, 16-, or 8-bit value of that register without losing any
SCLK cycle. After the last bit is transmitted, the master sets the
SS and SCLK lines high at the end of the SCLK cycle and the
communication ends. The data lines, MOSI and MISO, go into
a high impedance state. See
for details of the SPI write
operation.
0
15 14
SCLK
MOSI
10 31 30
10
0
000 0
REGISTER ADDRESS
REGISTER VALUE
SS
08
51
0-
06
3
Figure 85. SPI Write Operation of a 32-Bit Register
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