S1C63666 TECHNICAL MANUAL
EPSON
47
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
4.6.6 Programming notes
(1) When using the output port (R02, R03) as the special output port, fix the data register (R02, R03) at "1"
and the high impedance control register (R02HIZ, R03HIZ) at "0" (data output).
Be aware that the output terminal is fixed at a low (V
SS
) level the same as the DC output if "0" is
written to the R02 and R03 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 (R02HIZ, R03HIZ).
(2) A hazard may occur when the FOUT signal and the TOUT signal are turned on and off.
(3) When f
OSC3
is selected for the FOUT signal frequency, it is necessary to control the OSC3 oscillation
circuit before output.
Refer to Section 4.4, "Oscillation Circuit", for the control and notes.