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Giải thích chi tiết về linh kiện  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
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AT83SND1CXXX-ROTIL bảng dữ liệu(HTML) 151 Page - ATMEL Corporation

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4109J–8051–10/06
AT8xC51SND1C
18.3.2
Slave Configuration
The SPI operates in slave mode when the MSTR bit in SPCON is cleared and data has been
loaded is SPDAT.
18.3.3
Data Exchange
There are 2 possible methods to exchange data in master and slave modes:
•
polling
•
interrupts
18.3.4
Master Mode with Polling Policy
Figure 18-9 shows the initialization phase and the transfer phase flows using the polling method.
Using this flow prevents any overrun error occurrence.
The bit rate is selected according to Table 121. The transfer format depends on the slave
peripheral.
SS may be deasserted between transfers depending also on the slave peripheral.
SPIF flag is cleared when reading SPDAT (SPSTA has been read before by the “end of transfer”
check).
This polling method provides the fastest effective transmission and is well adapted when com-
municating at high speed with other microcontrollers. However, the procedure may then be
interrupted at any time by higher priority tasks.



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