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AT89C5132-ROTIL датащи(PDF) 127 Page - ATMEL Corporation

номер детали AT89C5132-ROTIL
подробное описание детали  USB Microcontroller with 64K Bytes Flash Memory
PDF  182 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5132-ROTIL датащи(HTML) 127 Page - ATMEL Corporation

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4173E–USB–09/07
AT89C5132
Figure 19-10. Master SPI Interrupt Policy Flows
19.3.6
Slave Mode with Polling Policy
Figure 19-11 shows the initialization phase and the transfer phase flows using the polling policy.
The transfer format depends on the master controller.
SPIF flag is cleared when reading SPDAT (SPSTA has been read before by the “end of recep-
tion” check).
This policy provides the fastest effective transmission and is well adapted when communicating
at high speed with other Microcontrollers. However, the procedure may be interrupted at any
time by higher priority tasks.
SPI Initialization
Interrupt Policy
Enable Interrupt
ESPI =1
SPI Interrupt
Service Routine
Select Master Mode
MSTR = 1
Select Bit Rate
Program SPR2:0
Select Format
Program CPOL & CPHA
Enable SPI
SPEN = 1
Read Status
Read SPSTA
Start New Transfer
Write Data in SPDAT
Last Transfer?
Get Data Received
Read SPDAT
Disable Interrupt
SPIE = 0
Select Slave
Pn.x = L
Start Transfer
Write Data in SPDAT
Deselect Slave
Pn.x = H



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