SIC63616-(Rev. 1.0) NO. P48
3240-0412
Table 4.5.6.2 FOUT frequency selection
FOUT3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
FOUT2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
FOUT1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
FOUT0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
FOUT frequency
f
OSC3
f
OSC3
/ 2
f
OSC3
/ 4
f
OSC3
/ 8
f
OSC3
/ 16
f
OSC3
/ 32
f
OSC3
/ 64
f
OSC3
/ 256
f
OSC1
(32 kHz)
f
OSC1
/ 2 (16 kHz)
f
OSC1
/ 4 (8 kHz)
f
OSC1
/ 16 (2 kHz)
f
OSC1
/ 32 (1 kHz)
f
OSC1
/ 64 (512 Hz)
f
OSC1
/ 256 (128 Hz)
Off
f
OSC1
: OSC1 oscillation frequency. ( ) indicates the clock frequency when f
OSC1
= 32 kHz.
f
OSC3
: OSC3 oscillation frequency
When the FOUT frequency is set to "f
OSC3
/n", the OSC3 oscillation circuit must be turned on before
outputting the FOUT signal. A time interval of several tens of µsec to several tens of msec, from turning
the OSC3 oscillation circuit on until the oscillation stabilizes, is necessary, due to the oscillation element
that is used. Consequently, if an abnormality occurs as the result of an unstable FOUT signal being
output externally, you should allow an adequate waiting time after turning the OSC3 oscillation on,
before starting FOUT output. (The oscillation start time will vary somewhat depending on the oscillator
and on the externally attached parts. Refer to the oscillation start time example indicated in Chapter 7,
"Electrical Characteristics".)
Since the FOUT signal is generated asynchronously from the FOUT0–FOUT3 registers, a hazard of a 1/2
cycle or less is generated when the signal is turned on or off by setting the registers.
Figure 4.5.6.2 shows the output waveform of the FOUT signal.
FOUT0–3
FOUT output (P23)
0
0
Other than 0
Fig. 4.5.6.2 Output waveform of FOUT signal
Note: The P23 terminal used for FOUT output is also shared with the SRDY output or SS input for the
serial interface. When the P23 port is configured for the serial interface, the FOUT0–FOUT3 registers
become ineffective.
BZ (P03)
The P03 terminal can output the BZ signal.
The BZ signal is the buzzer signal generated by the sound generator.
Use the BZE or BZSHT register for controlling (On/Off) the BZ signal output.
Refer to Section 4.11, "Sound Generator", for details of the buzzer signal and controlling method.
Note: The P03 terminal used for BZ output is also shared with the RFOUT output for the R/f converter. Do
not enable the RFOUT and BZ signals to output simultaneously.
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