DSP56857 datasheet(291/662 Pages) FREESCALE

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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

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

98765

4321

SCSCR

SPR

DSO ERRIE

MODF

SPRIE

SPMS

CPOL CPHA SPE SPTIE

SPRF OVRF MODF SPTE

SPDSCR

WOM

TDMA

RDMA

TDS

SPDRR

R15

R14

R13

R12

R11

R10

R9R8R7R6R5R4R3

R2R1R0

SPDTR

T15

T14

T13

T12

T11

T10

T9T8

T4T3T2T1

Read as 0

Reserved

Figure 11-13. SPI Register Map Summary

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