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AT89C5132-ROTUL bảng dữ liệu(PDF) 126 Page - ATMEL Corporation

tên linh kiện AT89C5132-ROTUL
Giải thích chi tiết về linh kiện  USB Microcontroller with 64K Bytes Flash Memory
PDF  181 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5132-ROTUL bảng dữ liệu(HTML) 126 Page - ATMEL Corporation

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4173D–USB–02/06
AT89C5132
Figure 19-9. Master SPI Polling Policy Flows
19.3.5
Master Mode with Interrupt Policy
Figure 19-10 shows the initialization phase and the transfer phase flows using the interrupt pol-
icy. Using this flow prevents any overrun error occurrence.
•
The bit rate is selected according to Table 97.
•
The transfer format depends on the slave peripheral.
•
SS may be deasserted between transfers depending also on the slave peripheral.
Reading SPSTA at the beginning of the ISR is mandatory for clearing the SPIF flag. Clear is
effective when reading SPDAT.
SPI Initialization
Polling Policy
Disable Interrupt
SPIE = 0
SPI Transfer
Polling Policy
End Of Transfer?
SPIF = 1?
Select Master Mode
MSTR = 1
Select Bit Rate
program SPR2:0
Select Format
program CPOL & CPHA
Enable SPI
SPEN = 1
Select Slave
Pn.x = L
Start Transfer
Write Data in SPDAT
Last Transfer?
Get Data Received
Read SPDAT
Deselect Slave
Pn.x = H



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