UPSD33XX Datasheet, PDF (114/231 Pages) STMicroelectronics – Fast 8032 MCU with Programmable Logic

uPSD33xx
Figure 43. SPI Receive Operation Example
SPICLK
(SPO=0)
1 frame
SPICLK
(SPO=1)
SPIRXD
Bit7
Bit0
Bit1
Bit7
Bit0
Bit1
Bit7
RISF
RORIS
BUSY
SPIINTR
SPIRDR Full
interrupt requested
Interrupt handler
read data in SPIRDR
SPIRDR Full
interrupt requested
Transmit End
interrupt requested
AI07855
Figure 44. SPI Transmit Operation Example
SPICLK
(SPO=0)
1 frame
SPICLK
(SPO=1)
SPITXD
Bit0
Bit1
Bit7
Bit0
Bit1
Bit7
TISF
TEISF
BUSY
SPISEL
SPIINTR
SPITDR Empty
interrupt requested
Interrupt handler
write data in TDR
SPITDR Empty
interrupt requested
Transmit End
interrupt requested
AI07854
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