U4255BM-M Datasheet, PDF (18/32 Pages) ATMEL Corporation – AM / FM RECEIVER IC

Data Transfer
Table 31. Control Registers
A24_100
M
S
BYTE 3
B
LS
B
MSB
BYTE 2
LS
B
MSB
BYTE 1
LS
B
ADDR.
AM/FM/WB
Gain FM
IF amplifier
Sear
ch
Width of window
OSC divider/multipath
sensitivity
Field
stren
gth
BWM
PX
Time window stop signal
1 0 0 AM FM
B9
3
B9
2
B9
1
B9
0
B8
9
B88
B8
7
B8
6
B8
5
B8
4
B8
3
B8
2
B8
1
B80
B79
B7
8
B7
7
B7
6
B7
5
B7
4
B7
3
A24_101
M
S
B
ADDR.
1 01
BYTE 3
WB-
Demod-
Gain
B7 B7
2
1
LS
B
MSB
Start Smute
Smu
te
Tk-
FM IF
B7
0
B6
9
B6
8
B67
B66
BYTE 2
FM-AGC
AM-AGC
B6 B6 B6 B6
5
4
3
2
LS
B
MSB
BYTE 1
LS
B
FM BW 2^nd
mixer
B6 B6
1
0
IF2 center frequency
MP
FS
FM
ext
De Not
m. use
Adj.
d
x
B59
B58
B5
7
B5
6
B5
5
B5
4
B5
3
B5
2
A24_111
M
S
BYTE 3
B
LS
B
MSB
BYTE 2
LS
B
MSB
BYTE 1
LS
B
ADDR.
used in test mode only
center frequency of bandfilter
bandwidth adj. channel
sensor
1 11
x
x
1
0
0
0
0
1
0
1
B3
0
B2
9
B2
8
B2
7
B2
6
B25
B24
B2
3
B2
2
B2
1
B2
0
B1
9
B1
8
B17
B16
B1
5
B1
4
B1
3
B1
2
B1
1
B1
0
A8_100
M
S
BYTE 1
B
LS
B
ADDR.
Tes MP Mut
t
off
e
Adj.
channel
sensor
1 00
0
B9 B8 B7 B6 B5
A8_101
M
S
B
ADDR.
1 01
BYTE 1
Optimi
ze
LS
B
Band width
B4
B3 B2 B1 B0
18 U4255BM-M
4519C–AUDR–07/02