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EPSON
S1C6N3B0 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIARCUITS AND OPERATION (Output Ports)
4.4 Output Ports (R00–R03)
4.4.1 Configuration of output port
The S1C6N3B0 Series has 4 bits of general output ports (R00–R03).
Output specifications of the output ports can be selected individually with the mask option. Two kinds of
output specifications are available: complementary output and Nch open drain output. Also, the mask
option enables the output ports R00 and R01 to be used as special output ports. Figure 4.4.1.1 shows the
configuration of the output ports.
VDD
VSS
R
Data
bus
Mask option
Data
register
Address
Fig. 4.4.1.1 Configuration of output ports
In the DC output mode, the output terminal goes high (VDD) when "1" is written to the data register and
goes low (VSS) when "0" is written. At initial reset, the output terminal goes high.
4.4.2 Mask option
The mask option enables the following output port selection.
(1) Output specifications of output ports
The output specifications for the output ports (R00–R03) can be selected from complementary output
and Nch open drain output for each of the four bits. However, even when Nch open drain output is
selected, a voltage exceeding the power voltage must not be supplied to the output port.
(2) Special output
In addition to the regular DC output, special output can be selected for output ports R00 and R01, as
shown in Table 4.4.2.1.
Table 4.4.2.1 Special output
Output port
R00
R01
Special output
FOUT or BUZZER output
BUZZER output
(3) BUZZER signal polarity
When driving a buzzer using the BUZZER (R01) output terminal only, the polarity of the BUZZER
signal off status can be selected.