TC1784
System Control Unit (SCU)
User´s Manual
3-47
V1.1, 2011-05
32-bit SCU, V1.18
FDR
Fractional Divider Register
(038
H
)
Reset Value: 0000 0000
H
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
DIS
CLK
0
RESULT
rwh
r
rh
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DM
0
STEP
rw
r
rw
Field
Bits
Type Description
STEP
[9:0]
rw
Step Value
In Normal Divider Mode, STEP contains the reload
value for RESULT.
In Fractional Divider Mode, this bit field determines
the 10-bit value that is added to RESULT with each
input clock cycle.
DM
[15:14]
rw
Divider Mode
This bit fields determines the functionality of the
fractional divider block.
00
B
Fractional divider is switched off; no output
clock is generated. The Reset External Divider
signal is 1. RESULT is not updated (default
after System Reset).
01
B
Normal Divider Mode selected.
10
B
Fractional Divider Mode selected.
11
B
Fractional divider is switched off; no output
clock is generated. RESULT is not updated.
RESULT
[25:16]
rh
Result Value
In Normal Divider Mode, RESULT acts as reload
counter (ad1).
In Fractional Divider Mode, this bit field contains the
result of the addition STEP.
If DM is written with 01
B
or 10
B
, RESULT is loaded
with 3FF
H
.
Содержание TC1784
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