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AT87C5103-ICSIL Datasheet(PDF) 26 Page - ATMEL Corporation |
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AT87C5103-ICSIL Datasheet(HTML) 26 Page - ATMEL Corporation |
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26 / 64 page  26 AT8xC5103 4134C–8051–09/04 Serial Peripheral Data Register (SPDAT) The Serial Peripheral Data Register (Table 13) 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 13. SPDAT (S:C5h): 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 76 543 210 R7 R6 R5 R4 R3 R2 R1 R0 |
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