Output Ports (R00-R03); Configuration Of Output Ports; Mask Option - Epson S1C63454 Technical Manual

4.5 Output Ports

4.5.1 Configuration of output ports

The S1C63454 has 4 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 N-channel open drain output.
Figure 4.5.1.1 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 4.5.1.1 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 fixd at "0" (data output).

4.5.2 Mask option

Output specifications of the output ports can be selected with the mask option.
The output specifications of the output ports R00–R03 can be selected from either complementary output
or N-channel open drain output individually (in 1-bit units).
However, when N-channel open drain output is selected, do not apply a voltage exceeding the power
supply voltage to the output port.
S1C63454 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
(R00–R03)
Address
High impedance
control register
Data register
Address
Fig. 4.5.1.1 Configuration of output port
Table 4.5.1.1 Function setting of output terminals
Terminal Terminal status
name at initial reset
R00 R00 (High output)
R01 R01 (High output)
R02 R02 (High output)
R03 R03 (High output)
Mask option
Special output
TOUT FOUT
R00 R00
R01 R01
TOUT
FOUT
EPSON
V
DD
Rxx
V
SS
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