Datasheet

TEF6901A_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 March 2008 14 of 107
NXP Semiconductors
TEF6901A
Integrated car radio
8.1.1 Read mode: data byte IFCOUNTER
Table 6. IFCOUNTER - format of data byte 0
7 6 5 4 3 2 1 0
IFCM1 IFCM0 IFCS IFCA IFC3 IFC2 IFC1 IFC0
Table 7. IFCOUNTER - data byte 0 bit description
Bit Symbol Description
7 and 6 IFCM[1:0] IF counter mode; IFCM reads 00 immediately after I
2
C-bus start of
PRESET, SEARCH, AFU, JUMP or CHECK until the first IFC result of the
new tuning is available.
00 = no new counter result available (IFC value is previous result or
reset state)
01 = new counter result available (IFC value is new result)
10 = counter result from AF update (IFC value is AF result, value is
held until I
2
C-bus read). Also the detector information of LEV, USN,
WAM and MOD shows AF update results.
11 = Power-On Reset (POR) or undefined state of the state machine is
detected. The I
2
C-bus data is reset to POR state.
5 IFCS IF counter sign
0 = the IF counter result indicates a positive RF frequency error
1 = the IF counter result indicates a negative RF frequency error
4 IFCA IF counter accuracy
0 = IF counter result with 1 kHz resolution in FM mode and 0.5 kHz
resolution in AM mode
1 = IF counter result with 8 kHz resolution in FM mode and 4 kHz
resolution in AM mode
3 to 0 IFC[3:0] IF counter result; see
Table 8
Table 8. IF counter result
IFC3 IFC2 IFC1 IFC0 Deviation from nominal value in FM Deviation from nominal value in AM
IFCA = 0 IFCA = 1 IFCA = 0 IFCA = 1
0 0 0 0 0 kHz to 1 kHz reset state 0 kHz to 0.5 kHz reset state
0 0 0 1 1 kHz to 2 kHz - 0.5 kHz to 1 kHz -
0 0 1 0 2 kHz to 3 kHz 16 kHz to 24 kHz 1 kHz to 1.5 kHz 8 kHz to 12 kHz
0 0 1 1 3 kHz to 4 kHz 24 kHz to 32 kHz 1.5 kHz to 2 kHz 12 kHz to 16 kHz
0 1 0 0 4 kHz to 5 kHz 32 kHz to 40 kHz 2 kHz to 2.5 kHz 16 kHz to 20 kHz
0 1 0 1 5 kHz to 6 kHz 40 kHz to 48 kHz 2.5 kHz to 3 kHz 20 kHz to 24 kHz
0 1 1 0 6 kHz to 7 kHz 48 kHz to 56 kHz 3 kHz to 3.5 kHz 24 kHz to 28 kHz
0 1 1 1 7 kHz to 8 kHz 56 kHz to 64 kHz 3.5 kHz to 4 kHz 28 kHz to 32 kHz
1 0 0 0 8 kHz to 9 kHz 64 kHz to 72 kHz 4 kHz to 4.5 kHz 32 kHz to 36 kHz
1 0 0 1 9 kHz to 10 kHz 72 kHz to 80 kHz 4.5 kHz to 5 kHz 36 kHz to 40 kHz
1 0 1 0 10 kHz to 11 kHz 80 kHz to 88 kHz 5 kHz to 5.5 kHz 40 kHz to 44 kHz
1 0 1 1 11 kHz to 12 kHz 88 kHz to 96 kHz 5.5 kHz to 6 kHz 44 kHz to 48 kHz
1 1 0 0 12 kHz to 13 kHz 96 kHz to 104 kHz 6 kHz to 6.5 kHz 48 kHz to 52 kHz