u4255bm ATMEL Corporation, u4255bm Datasheet - Page 6

• Manufacturer Part Number: u4255bm
• Description: Am/fm Receiver
• Manufacturer: ATMEL Corporation

Bus Timing
Bus Control
The operating mode is set by the Bits 92 and 93
The Bits 89 to 91 control gain of the FM IF amplifier
U4255BM
6 (12)
AM/FM/Weather Channel
Weather band
Gain FM-IF
Standby
Enable
Clock
19 dB
21 dB
23 dB
25 dB
27 dB
28 dB
29 dB
30 dB
AM
FM
Data
t
R
t
t
S
R
Bit 91
Bit 93
0
0
0
0
1
1
1
1
t
S
t
R
0
0
1
1
t
H
Bit 90
0
0
1
1
0
0
1
1
t
L
t
HDA
Bit 92
Bit 89
Figure 4. Bus timing
0
1
0
1
0
1
0
1
0
1
0
1
Bit 88 switches the search mode on/off
Bits 88 to 87 select the search-stop deviation from the
center frequency
Search-Stop Window
Station Search
Receive
0.5 kHz
1.1 kHz
2.3 kHz
4.8 kHz
10 kHz
20 kHz
40 kHz
80 kHz
Search
t
F
t
F
t
HEN
Bit 87
0
0
0
0
1
1
1
1
96 11826
Rev. A1, 26-Jun-00
t
F
Bit 88
Bit 86
0
1
0
0
1
1
0
0
1
1
Bit 85
0
1
0
1
0
1
0
1