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AT83SND2CMP3B bảng dữ liệu(PDF) 163 Page - ATMEL Corporation

tên linh kiện AT83SND2CMP3B
Giải thích chi tiết về linh kiện  Single-Chip Flash Microcontroller with MP3 Decoder with Full Audio Interface
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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4341F–MP3–03/06
AT8xC51SND2C/MP3B
Figure 19-10.
Master SPI Interrupt Flows
19.3.6
Slave Mode with Polling Policy
Figure 19-11 shows the initialization phase and the transfer phase flows using the polling.
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 provides the fastest effective transmission and is well adapted when communicating at high
speed with other Microcontrollers. However, the process may then 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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