UPSD3354DV-40U6 Datasheet, PDF (144/272 Pages) STMicroelectronics – fast 8032 MCU with programmable logic

Synchronous peripheral interface (SPI)
UPSD33xx
Figure 42. SPI Receive operation example
SPICLK
(SPO=0)
1 frame
SPICLK
(SPO=1)
SPIRXD
Bit7
Bit0
Bit1
Bit7
Bit0
Bit1
Bit7
RISF
RORIS
BUSY
SPIINTR
t(s) _{SPIRDR Full}
c _{interrupt requested}
Interrupt handler
read data in SPIRDR
SPIRDR Full
interrupt requested
rodu _{Figure 43. SPI Transmit operation example}
te ^P _SPICLK
le (SPO=0)
1 frame
so _SPICLK
b _(SPO=1)
- ^O _SPITXD
Bit0
Bit1
Bit7
Bit0
Bit1
Transmit End
interrupt requested
AI07855
Bit7
t(s) _TISF
roduc ^TEISF
P _BUSY
olete SPISEL
Obs ^SPIINTR
SPITDR Empty
interrupt requested
Interrupt handler
write data in TDR
SPITDR Empty
interrupt requested
Transmit End
interrupt requested
AI07854
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Doc ID 9685 Rev 7