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AT89C5122DS-RDRUM 데이터시트(PDF) 144 Page - ATMEL Corporation

부품명 AT89C5122DS-RDRUM
상세설명  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5122DS-RDRUM 데이터시트(HTML) 144 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
Serial Peripheral DATa Register
(SPDAT)
The Serial Peripheral Data Register (Table 87) is a read/write buffer for the receive data
register. A write to SPDAT places data directly into the shift register. No transmit buffer
is available in this model.
A read of the SPDAT returns the value located in the receive buffer and not the content
of the shift register.
Reset Value = XXXX XXXXb
Table 87.
Serial Peripheral Data Register - SPDAT (C5h)
7654
3210
R7
R6
R5
R4
R3
R2
R1
R0
Bit Number
Bit
Mnemonic Description
7-0
R7:0
Receive data bits
SPCON, SPSTA and SPDAT registers may be read and written at any time while
there is no on-going exchange. However, special care should be taken when
writing to them while a transmission is on-going:
Do not change SPR2, SPR1 and SPR0
Do not change CPHA and CPOL
Do not change MSTR
Clearing SPEN would immediately disable the peripheral
Writing to the SPDAT will cause an overflow



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