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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC312XDP512F0MPVR датащи(PDF) 522 Page - Freescale Semiconductor, Inc |
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SC312XDP512F0MPVR датащи(HTML) 522 Page - Freescale Semiconductor, Inc |
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522 / 1348 page  Chapter 12 Serial Peripheral Interface (S12SPIV4) MC9S12XDP512 Data Sheet, Rev. 2.21 522 Freescale Semiconductor 12.3.2.3 SPI Baud Rate Register (SPIBR) Read: Anytime Write: Anytime; writes to the reserved bits have no effect The baud rate divisor equation is as follows: BaudRateDivisor = (SPPR + 1) • 2(SPR + 1) Eqn. 12-1 The baud rate can be calculated with the following equation: Baud Rate = BusClock / BaudRateDivisor Eqn. 12-2 NOTE For maximum allowed baud rates, please refer to the SPI Electrical Specification in the Electricals chapter of this data sheet. Table 12-4. Bidirectional Pin Configurations Pin Mode SPC0 BIDIROE MISO MOSI Master Mode of Operation Normal 0 X Master In Master Out Bidirectional 1 0 MISO not used by SPI Master In 1 Master I/O Slave Mode of Operation Normal 0 X Slave Out Slave In Bidirectional 1 0 Slave In MOSI not used by SPI 1 Slave I/O 76543210 R0 SPPR2 SPPR1 SPPR0 0 SPR2 SPR1 SPR0 W Reset 00000000 = Unimplemented or Reserved Figure 12-5. SPI Baud Rate Register (SPIBR) Table 12-5. SPIBR Field Descriptions Field Description 6–4 SPPR[2:0] SPI Baud Rate Preselection Bits — These bits specify the SPI baud rates as shown in Table 12-6. In master mode, a change of these bits will abort a transmission in progress and force the SPI system into idle state. 2–0 SPR[2:0] SPI Baud Rate Selection Bits — These bits specify the SPI baud rates as shown in Table 12-6. In master mode, a change of these bits will abort a transmission in progress and force the SPI system into idle state. |
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