Epson S1C63656 Technical Manual page 50

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
• 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 programmable timer.
Note: A hazard may occur when the TOUT signal is turned on and off.
Figure 4.5.4.2 shows the output waveform of the TOUT signal.
• 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.
f is available when a mask option for using the OSC3 oscillation circuit is selected. If the system
OSC3
uses the OSC1 oscillation circuit only, do not set the FOFQ register to "11".
Note: A hazard may occur when the FOUT signal is turned on and off.
Figure 4.5.4.3 shows the output waveform of the FOUT signal.
40
R02HIZ register
R02 register
PTOUT register "0"
TOUT output
Fig. 4.5.4.2 Output waveform of TOUT signal
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
0
0
f : Clock that is output from the OSC1 oscillation circuit
OSC1
f : Clock that is output from the OSC3 oscillation circuit
OSC3
R03HIZ register
R03 register
FOUTE register "0"
FOUT output
Fig. 4.5.4.3 Output waveform of FOUT signal
Fix at "0"
Fix at "1"
"1"
Clock frequency
1 f
OSC3
0 f
OSC1
× 1/8
1 f
OSC1
× 1/64
0 f
OSC1
Fix at "0"
Fix at "1"
"1"
EPSON
"0"
"0"
S1C63656 TECHNICAL MANUAL