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DSP56857 Datasheet(PDF) 291 Page - Freescale Semiconductor, Inc |
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DSP56857 Datasheet(HTML) 291 Page - Freescale Semiconductor, Inc |
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291 / 662 page  Module Memory Map Serial Peripheral Interface (SPI), Rev. 4 Freescale Semiconductor 11-21 To clear the MODF flag, write 1 to the MODF bit in the SPSCR. The clearing mechanism must occur with no MODF condition existing or else the flag is not cleared. 11.10 Module Memory Map Four registers (Table 11-3) control and monitor SPI operations. Two of the four registers are read/write registers. They should be accessed only with word accesses. Accesses other than word lengths result in undefined results. Two registers are read- and write-only. Table 11-3. SPI Module Memory Map (SPI_BASE = $1FFFE8) Address Offset Register Acronym Register Name Access Type Chapter Location Base + $0 SPSCR SPI Status and Control Register Read/Write Section 11.11.1 Base + $1 SPDSCR SPI Data Size and Control Reg. Read/Write Section 11.11.2 Base + $2 SPDRR SPI Data Receive Register Read-Only Section 11.11.3 Base + $3 SPDTR SPI Data Transmit Register Write-Only Section 11.11.4 Note: SPI registers are not available on the 56855 chip Add. Offset Register Name 15 14 13 12 11 10 98765 4321 0 $0 SCSCR R SPR DSO ERRIE MODF EN SPRIE SPMS TR CPOL CPHA SPE SPTIE SPRF OVRF MODF SPTE W $1 SPDSCR R WOM TDMA EN RDMA EN 0 0 0 0 0 0 0 0 0 TDS W $2 SPDRR R R15 R14 R13 R12 R11 R10 R9R8R7R6R5R4R3 R2R1R0 W $3 SPDTR R 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 W T15 T14 T13 T12 T11 T10 T9T8 T7 T6 T5 T4T3T2T1 T0 R 0 Read as 0 W Reserved Figure 11-13. SPI Register Map Summary |
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