參數(shù)資料
型號： ADE7169ACPZF16
廠商： ANALOG DEVICES INC
元件分類： 模擬信號調(diào)理
英文描述： Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver
中文描述： SPECIALTY ANALOG CIRCUIT, QCC64
封裝： 9 X 9 MM, ROHS COMPLIANT, MO-22-VMMD-4, LFCSP-64
文件頁數(shù)： 127/140頁
文件大?。?/td> 1359K
代理商： ADE7169ACPZF16
Preliminary Technical Data
ADE7169F16
Continuous 1
Rev. PrD | Page 127 of 140
Step 1: Write to SPITx SFR
Step 2:
SS
is asserted low and write routine is initiated
Step 3: Wait for SPITxIRQ Interrupt flag to write to SPITx SFR. Transfer will continue
until the SPITX register and transmit shift registers are empty.
Step 4: SPITxIRQ Interrupt Flag is set when SFRTx register is empty
Step 5:
SS
is deasserted high
Step 6: Write to SPITx SFR to clear SPITxIRQ Interrupt flag
1
Figure 82
shows the SPI output for certain automatic chip select
and continuous mode selections. Note that if the continuous
mode is not used, a short delay is inserted between transfers.
SCLK
SS
DOUT
DIN
DIN1
DIN2
AUTO_SS=1
SPICONT=0
SCLK
SS
DOUT
DIN
DIN1
AUTO_SS=1
SPICONT=1
DIN2
AUTO_SS=0
SPICONT=0
(manual SS control)
DOUT1
DOUT2
DOUT1
DOUT2
SCLK
SS
DOUT
DIN
DIN1
DIN2
DOUT1
DOUTz2
Figure 82: Automatic Chip Select and Continuous Mode Output
SPI INTERRUPT AND STATUS FLAGS
The SPI interface has several status flags that indicate the status
of the double buffered receive and transmit registers. Figure 83
shows when the status and interrupt flags are raised. The
transmit interrupt occurs when the transmit shift register is
loaded with the data in the SPI/I2C Transmit Buffer SFR
(SPI2CTx, 0x9A) register. If the SPI master is in transmit
operating mode and the SPI/I2C Transmit Buffer SFR
(SPI2CTx, 0x9A) register has not been written with new data by
the beginning of the next byte transfer, the transmit operation
stops.
When a new byte of data is received in the SPI Receive Buffer
SFR (SPI2CRx, 0x9B) register, the SPI receive interrupt flag is
raised. If the data in the SPI Receive Buffer SFR (SPI2CRx,
0x9B) register is not read before new data is ready to be loaded
into the SPI Receive Buffer SFR (SPI2CRx, 0x9B), an overflow
condition has occurred. This overflow condition, indicated by
the SPIRxOF flag, will force the new data to be discarded or
overwritten if the RxOF_EN bit is set.
SPITX
TRANSMIT SHIFT REGISTER
SPITxIRQ=1
SPITX (empty)
TRANSMIT SHIFT REGISTER
Stops Transfer if TIMODE=1
SPIRX
RECEIVE SHIFT REGISTER
SPIRxIRQ=1
SPIRX (full)
RECEIVE SHIFT REGISTER
SPIRxOF=1
Figure 83: SPI Receive and Transmit Interrupt and Status Flags
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