DSP56303 datasheet(267/292 Pages) FREESCALE

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Programming Sheets

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

B-23

Figure B-14. ESSI Control Register A (CRA)

Application:

Date:

Programmer:

Sheet 1 of 3

ESSI

15 14 13 12 11 10

9876543

210

PM7

PM5

PM4 PM3

PM2 PM1

PM0

19 18 17 16

23 22 21 20

ALC

WL0

WL1

SSC1

* = Reserved, Program as 0

PM6

Word Length Control

WL2

WL1

WL0

Number of bits/word

000

001

010

011

32 (data in first 24 bits)

32 (data in last 24 bits)

110

Reserved

111

Reserved

Select SC1 as Tx#0 drive

enable

0 = SC1 functions as

serial I/O flag

1 = functions as driver

enable of Tx#0

external buffer

Frame Rate Divider Control

DC4:0 = $00-$1F (1 to 32)

Divide ratio for Normal mode

# of time slots for Network

Prescaler Range

0 = divide by 8

1 = divide by 1

Prescale Modulus Select

PM[7–0] = $00-$FF (divide by 1 to 256)

The combination of PSR = 1 and PM[7:0] = $00 is forbidden

WL2

DC4

DC3 DC2

DC1

DC0

PSR

Alignment Control

0 = 16-bit data left aligned to bit 23

1 = 16-bit data left aligned to bit 15

ESSI Control Register A (CRAx) ESSI0—X:$FFFFB5 Read/Write

ESSI1—X:$FFFFA5 Read/Write

Reset = $000000

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