ade7566 Analog Devices, Inc., ade7566 Datasheet - Page 124

• Manufacturer Part Number: ade7566
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc, And Lcd Driver
• Manufacturer: Analog Devices, Inc.

ADE7566/ADE7569
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 104
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/I
register. If the SPI master is in transmit operating mode, and the
SPI/I
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/I
Buffer SFR (SPI2CRx, 0x9B) register, the SPI receive interrupt
flag is raised. If the data in the SPI/I
2
C Transmit Buffer SFR (SPI2CTx, 0x9A) register has not
2
C Transmit Buffer SFR (SPI2CTx, 0x9A)
SPICPHA = 0
SPICPHA = 1
2
C Receive Buffer SFR
SPITx1 FLAGS
SPITx0 FLAGS
SPIRx1 AND
SPIRx0 AND
(SPICPOL = 1)
SPITx1 FLAGS
SPITx0 FLAGS
(SPICPOL=0)
SPIRx1 AND
SPIRx0 AND
MISO
MOSI
SCLK
SCLK
SS_b
2
MISO
MOSI
C Receive
Figure 105. SPI Timing Configurations
MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB
MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB
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MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB
MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB
(SPI2CRx, 0x9B) register is not read before new data is ready to
be loaded into the SPI/I
an overflow condition has occurred. This overflow condition,
indicated by the SPIRxOF flag, forces the new data to be discarded
or overwritten if the RxOFW bit is set.
TRANSMIT SHIFT REGISTER
TRANSMIT SHIFT REGISTER
Figure 104. SPI Receive and Transmit Interrupt and Status Flags
SPITx (EMPTY)
SPITx
STOPS TRANSFER IF TIMODE = 1
SPITxIRQ = 1
2
C Receive Buffer SFR (SPI2CRx, 0x9B),
?
?
RECEIVE SHIFT REGISTER
RECEIVE SHIFT REGISTER
SPIRx (FULL)
SPIRx
SPIRxOF = 1
SPIRxIRQ = 1