Epson S1C63558 Technical Manual page 45

Note: • Be aware that the output terminal is fixed at a low (V
written to the R00–R03 and R10–R13 registers when the special output has been selected.
• Be aware that the output terminal shifts into high impedance status when "1" is written to the
high impedance control register (R00HIZ–R03HIZ, R10HIZ–R13HIZ).
• A hazard may occur when the special output signal is turned ON and OFF by software.
• XBZ (R00)
The R00 terminal can output an XBZ signal.
The XBZ signal is the buzzer inverted signal that is output from the sound generator, and can be used
to drive a piezoelectric buzzer with the BZ signal.
To output the XBZ signal, set the R00 port as the XBZ output by writing "1" to the XBZOUT register
and fix the R00 register at "1" and the R00HIZ register at "0". Use the BZE register for controlling
(ON/OFF) the XBZ signal output.
Refer to Section 4.12, "Sound Generator" for details of the buzzer signal and controlling method.
• BZ (R01)
The R01 terminal can output a BZ signal.
The BZ signal is the buzzer signal that is output from the sound generator.
To output the BZ signal, set the R01 port as the BZ output by writing "1" to the BZOUT register and fix
the R01 register at "1" and the R01HIZ register at "0". Use the BZE register for controlling (ON/OFF)
the BZ signal output.
Refer to Section 4.12, "Sound Generator" for details of the buzzer signal and controlling method.
• TOUT (R02)
The R02 terminal can output a TOUT signal.
The TOUT signal is the clock that is output from the programmable timer, and can be used to provide
a clock signal to an external device.
To output the TOUT signal, fix the R02 register at "1" and the R02HIZ register at "0", and turn the
signal ON and OFF using the PTOUT register. It is, however, necessary to control the programmable
timer.
Refer to Section 4.10, "Programmable Timer" for details of the TOUT signal and controlling method.
• FOUT (R03)
The R03 terminal can output an FOUT signal.
The FOUT signal is a clock (f
f clock has divided in the internal circuit, and can be used to provide a clock signal to an external
OSC1
device.
To output the FOUT signal, fix the R03 register at "1" and the R03HIZ register at "0", and turn the
signal ON and OFF using the FOUTE register.
The frequency of the output clock may be selected from among 4 types shown in Table 4.5.4.2 by
setting the FOFQ0 and FOFQ1 registers.
When f is selected for the FOUT signal frequency, it is necessary to control the OSC3 oscillation
OSC3
circuit before output.
Refer to Section 4.3, "Oscillation Circuit", for the control and notes.
Figure 4.5.4.2 shows the output waveform of the FOUT signal.
S1C63558 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
or f ) that is output from the oscillation circuit or a clock that the
OSC1 OSC3
Table 4.5.4.2 FOUT clock frequency
FOFQ1 FOFQ0
1 1
1 0
0 1
0 0
f : Clock that is output from the OSC1 oscillation circuit
OSC1
f : Clock that is output from the OSC3 oscillation circuit
OSC3
EPSON
) level the same as the DC output if "0" is
SS
Clock frequency
f
OSC3
f
OSC1
f 1/8
OSC1
f 1/64
OSC1
35