Configuration Of Output Ports - Epson S1C63666 Technical Manual

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
4.6 Output Ports

4.6.1 Configuration of output ports

The S1C63666 has eight bits of general output ports.
Output specifications of the output ports can be selected individually with the mask option. Two kinds of
output specifications are available: complementary output and P-channel open drain output.
Figure 4.6.1.1 shows the configuration of the output port.
The R02 and R03 output terminals are shared with special output terminals (TOUT, FOUT), and this
function is selected by the software.
At initial reset, these are all set to the general purpose output port.
Table 4.6.1.1 shows the setting of the output terminals by function selection.
When using the output port (R02, R03) as the special output port, the data register must be fixed at "1"
and the high impedance control register must be fixed at "0" (data output).
4.6.2 Mask option
Output specifications of the output ports are selected by mask option.
Either complementary output or P-channel open drain output can be selected individually (in 1-bit units).
However, when P-channel open drain output is selected, do not apply a voltage exceeding the power
supply voltage to the output port.
42
(R00–R03 and R10–R13)
Address
High impedance
control register
Data register
Address
Fig. 4.6.1.1 Configuration of output port
Table 4.6.1.1 Function setting of output terminals
Terminal Terminal status
name at initial reset
R00 R00 (Low output)
R01 R01 (Low output)
R02 R02 (Low output)
R03 R03 (Low output)
R10–R13 R10–R13 (Low output)
Mask option
Special output
TOUT FOUT
R00 R00
R01 R01
TOUT
FOUT
R10–R13 R10–R13
EPSON
V
DD
Rxx
V
SS
S1C63666 TECHNICAL MANUAL