B-20, Figure b-20, Essi control register a (cra) – Motorola DSP56301 User Manual
Page 344: Essi, Figure b-20. essi control register a (cra)
Programming Sheets
B
-32
DSP56301 User’s Manual
Figure B-20. ESSI Control Register A (CRA)
Application:
Date:
Programmer:
Sheet 1 of 3
ESSI
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
PM7
PM5
PM4
PM3
PM2
PM1
PM0
19 18 17 16
23 22 21 20
ALC
WL0
WL1
SSC1
*
= Reserved, Program as 0
PM6
*
0
*
0
*
0
*
0
Word Length Control
WL2
WL1
WL0
Number of bits/word
0
0
0
8
0
0
1
12
0
1
0
16
0
1
1
24
1
0
0
32 (data in first 24 bits)
1
0
1
32 (data in last 24 bits)
1
1
0
Reserved
1
1
1
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] = $00 is forbidden
*
0
WL2
DC4
DC3 DC2
DC1
DC0
PSR
Alignment Control
0 = 16-bit data left aligned to bit 23
1 = 16-bit data left aligned to bit 15
ESSI Control Register A (CRAx) ESSI0—X:$FFFFB5 Read/Write
ESSI1—X:$FFFFA5 Read/Write
Reset = $000000