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AT83C5111 데이터시트(PDF) 43 Page - ATMEL Corporation

부품명 AT83C5111
상세설명  Low Pin Count 8-bit Microcontroller with A/D Converter
PDF  86 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83C5111 데이터시트(HTML) 43 Page - ATMEL Corporation

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43
AT8xC5111
4190A–8051–11/02
Serial Peripheral Data Register
(SPDAT)
The Serial Peripheral Data Register (Table 32) 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.
Table 5. Serial Peripheral Data Register
Reset value = XXXX XXXXb
R7:R0: 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
7654
3210
R7
R6
R5
R4
R3
R2
R1
R0



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