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Programming Sheets
Application:
ESSI
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
WL2
WL1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
23 22 21 20
19 18 17 16
*
SSC1
WL2
WL1
WL0
0
ESSI Control Register A (CRAx) ESSI0—X:$FFFFB5 Read/Write
Reset = $000000
B-26
Word Length Control
WL0
Number of bits/word
0
8
1
12
0
16
1
24
0
32 (data in first 24 bits)
1
32 (data in last 24 bits)
0
Reserved
1
Reserved
Alignment Control
0 = 16-bit data left aligned to bit 23
1 = 16-bit data left aligned to bit 15
Frame Rate Divider Control
DC4:0 = $00-$1F (1 to 32)
Divide ratio for Normal mode
# of time slots for Network
15 14 13 12 11 10 9
*
ALC
DC4
DC3 DC2
DC1
0
ESSI1—X:$FFFFA5 Read/Write
Figure B-15. ESSI Control Register A (CRA)
DSP56303 User's Manual
The combination of PSR = 1 and PM[7:0] = $00 is forbidden
Prescaler Range
0 = divide by 8
1 = divide by 1
8
7
*
*
*
DC0
PSR
PM7
0
0
0
*
Date:
Programmer:
Sheet 1 of 3
Prescale Modulus Select
PM[7–0] = $00-$FF (divide by 1 to 256)
6
5
4
3
2
1
PM6
PM5 PM4 PM3 PM2 PM1 PM0
= Reserved, Program as 0
0
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