 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
UPSD3312D Datasheet(PDF) 143 Page - STMicroelectronics |
|
|
|||||||||||||||||||||||||||||
UPSD3312D Datasheet(HTML) 143 Page - STMicroelectronics |
|
|
143 / 272 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) UPSD33xx Synchronous peripheral interface (SPI) Doc ID 9685 Rev 7 143/272 configuration (which means the user does not have to use the SPISEL signal from UPSD33xx in this case). The SPI specification does not specify high-level protocol for data exchange, only low-level bit-serial transfers are defined. 24.2 Full-duplex operation When an SPI transfer occurs, 8 bits of data are shifted out on one pin while a different 8 bits of data are simultaneously shifted in on a second pin. Another way to view this transfer is that an 8-bit shift register in the Master and another 8-bit shift register in the Slave are connected as a circular 16-bit shift register. When a transfer occurs, this distributed shift register is shifted 8 bit positions; thus, the data in the Master and Slave devices are effectively exchanged (see Figure 41 on page 143). 24.3 Bus-level activity Figure 42 on page 144 details an SPI receive operation (with respect to bus Master) and Figure 43 on page 144 details an SPI transmit operation. Also shown are internal flags available to firmware to manage data flow. These flags are accessed through a number of SFRs. Note: The UPSD33xx SPI interface SFRs allow the choice of transmitting the most significant bit (MSB) of a byte first, or the least significant bit (LSB) first. The same bit-order applies to data reception. Figure 42 and Figure 43 illustrate shifting the LSB first. Figure 41. SPI full-duplex data exchange SPI Bus Slave Device Master Device AI10485 SS SPITxD SPIRxD Baud Rate Generator 8-Bit Shift Register 8-Bit Shift Register SPICLK MOSI MISO SCLK |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
New Zealand ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
