FM1246/HM/I View Datasheet(PDF) - Philips Electronics
Part Name
Description
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FM1246/HM/I Datasheet PDF : 24 Pages
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Philips Components
Desktop video & FM radio module
system CCIR I
Preliminary specification
FM1246
TELEGRAM EXAMPLES (WRITE MODE)
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Pb - Ack - Stop.
Start - Adb - Ack - Cb - Ack - Pb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Stop.
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Where:
Start = start condition
Adb = address byte
Ack = acknowledge
Db1 = divider byte 1
Db2 = divider byte 2
Cb = control byte
Pb = ports byte
Stop = stop condition.
READ mode
The in-lock can be read by setting the R/W bit to 1.
BITS
BYTE
7
MSB
6
5
4
3
2
1
0
LSB
A(5)
Address byte
1
1
0
0
0
MA1
MA0
1
A
Status byte
POR(1)
FL(2)
I2(3)
I1(3)
I0(3)
A2(4)
A1(4)
A0(4)
A
Notes
1. POR = Power On Reset. POR is internally set to 1 in case VS drops below 3 V. The POR bit is reset when an end of
data is detected by the PLL IC.
2. FL = In-lock flag; FL = 1: loop is phase-locked. The loop must be phase-locked during at least 8 periods of the internal
reference frequency (either 7.8125 kHz, 3.90625 kHz or 6.25 kHz) before the FL flag is internally set to 1.
3. I2, I1 and I0 = digital information for I/O ports P2, P1 and P0 respectively.
4. A2, A1 and A0 = built-in 5-level A/D converter on the internal I/O port P6 (see Table “Digital AFC status”).
5. A = Acknowledge.
TELEGRAM EXAMPLES (READ MODE)
Start - Adb - Ack - STB - Ack - STB - - Stop (no Ack from processor = End-of-data).
Start - Adb - Ack - STB - - Stop (no Ack from processor = End-of-data).
Where:
STB = Status byte.
1997 May 14
15
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