PD178016GC-051_15 Datasheet, PDF (43/96 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER WITH BUILT-IN PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR AUTOMOTIVE FM/MW/LW RADIO APPLICATIONS

µPD178016GC-051
(2) AF operation disable time/AF reception disable time
(a) AF operation disable time
This is the period during which AF operation is disabled.
While the referenced disable timer is set, AF operation is not started.
(b) Setting of AF operation disable time
(i) When AF operation fails
The following AF operation disable time is set depending on the signal meter reading (S • M reading)
ranges when the AF operation was started.
S • M reading range
Range A
Range B
Range C
Disable time
5 seconds
60 to 5 seconds^Note
60 seconds
Note The AF operation disable time for range B is set as follows:
Range B is divided into 32 steps. The range into which the S • M reading falls is judged.
Range =
(S • M reading - Input value of SMT_B/C pin) × 32
(Input value of SMT_A/B pin - Input value of SMT_B/C pin)
Division is performed with the result truncated below the decimal point.
The disable time is set for each range as follows:
Range
31
30
29
10
9
8
7
6
5
4
3
2
1
0
Disable time (seconds)
60
58
56
Change of 2 seconds/range
18
16
14
12
11
10
9
8
7
6
5
41