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DVR21 Datasheet(PDF) 218 Page - Microchip Technology

Part # DVR21
Description  16-Bit General Purpose Microcontrollers with 256-Kbyte Flash and 16-Kbyte RAM in Low Pin Count Packages
PDF  416 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DVR21 Datasheet(HTML) 218 Page - Microchip Technology

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DS30010118D-page 218
 2016-2018 Microchip Technology Inc.
FIGURE 17-3:
SPIx MASTER/SLAVE CONNECTION (ENHANCED BUFFER MODES)
Serial Transmit FIFO
(SPIxTXB)(2)
Shift Register
(SPIxTXSR)
LSb
MSb
SDIx
SDOx
Processor 2 (SPIx Slave)
SCKx
SSx(1)
Serial Receive FIFO
(SPIxRXB)(2)
Serial Receive FIFO
(SPIxRXB)(2)
Shift Register
(SPIxRXSR)
MSb
LSb
SDOx
SDIx
Processor 1 (SPIx Master)
Serial Clock
MSSEN (SPIxCON1H<4>) = 1 and MSTEN (SPIxCON1L<5>) = 0
SCKx
Serial Transmit FIFO
(SPIxTXB)(2)
MSTEN (SPIxCON1L<5>) = 1
SPIx Buffer
(SPIxBUF)
SPIx Buffer
(SPIxBUF)
Shift Register
(SPIxTXSR)
Shift Register
(SPIxRXSR)
MSb
LSb
LSb
MSb
SDOx
SDIx
Note 1: Using the SSx pin in Slave mode of operation is optional.
2: User must write transmit data to read the received data from SPIxBUF. The SPIxTXB and SPIxRXB registers
are memory-mapped to SPIxBUF.



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