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数据搜索系统，热门电子元器件搜索 |
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AT89C5131A-RDTIM 数据表(PDF) 99 Page - ATMEL Corporation |
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AT89C5131A-RDTIM 数据表(HTML) 99 Page - ATMEL Corporation |
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99 / 184 page  99 AT89C5130A/31A-M 4337C–USB–02/05 Reset Value = 00X0 XXXXb Not Bit addressable Serial Peripheral Data Register (SPDAT) The Serial Peripheral Data Register (Table 78) 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 78. SPDAT Register SPDAT - Serial Peripheral Data Register (0C5H) Reset Value = Indeterminate 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 2- Reserved The value read from this bit is indeterminate. Do not set this bit 1- Reserved The value read from this bit is indeterminate. Do not set this bit. 0- Reserved The value read from this bit is indeterminate. Do not set this bit. Bit Number Bit Mnemonic Description 7654 3210 R7 R6 R5 R4 R3 R2 R1 R0 |
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