DSP56857 datasheet(259/662 Pages) FREESCALE

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SCI Register Descriptions (SCI0_BASE = $1FFFE0 and SCI1_BASE = $1FFDF8)

Serial Communications Interface (SCI), Rev. 4

Freescale Semiconductor

10-23

10.9 SCI Register Descriptions (SCI0_BASE = $1FFFE0 and

SCI1_BASE = $1FFDF8)

10.9.1 SCI Baud Rate (SCIBR)

This register can be read at anytime. Bits 12 through zero can be written at any time, but bits 15

through 13 are reserved and can be modified only in special modes.

Figure 10-17. SCI Baud Rate Register (SCIBR)

See Programmer’s Sheet on Appendix page B-53

The count in this register determines the baud rate of the SCI. The formula for calculating baud

rate is:

SBR = contents of the baud rate registers, a value of 1 to 8191

Note:

The baud rate generator is disabled until the TE or the RE bits are set for the first time

after reset. The baud rate generator is disabled when SBR = 0.

10.9.2 SCI Control Register (SCICR)

The SCI Control Register can be read/written at anytime.

Figure 10-18. SCI Control Register (SCICR)

See Programmer’s Sheets on Appendix page B-54

Base + $0

Read

SBR

Write

Reset

0000

0000000

000

Base + $1

Read

LOOP SWAI RSRC

WAKE POL

TEIE

TIIE

RFIE REIE

RWU

SBK

Write

Reset

000

SCI baud rate = SCI module clock

× SBR

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