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13.2.2. External Connections
Figure 13.2.2.1 shows a connection diagram between the UART3 in this IC and an external UART device.
Figure 13.2.2.1 Connections between UART3 and an External UART Device
13.2.3. Input Pin Pull-Up Function
The UART3 includes a pull-up resistor or the USINn pin. Setting the UART3_nMOD.PUEN bit to 1
enables the resistor to pull up the USINn pin.
13.2.4. Output Pin Open-Drain Output Function
The USOUTn pin supports the open-drain output function. Default configuration is a push-pull
output and it is switched to an open-drain output by setting the UART3_nMOD.OUTMD bit to 1.
13.2.5. Input/Output Signal Inverting Function
The UART3 can invert the signal polarities of the USINn pin input and the USOUTn pin output by
setting the UART3_nMOD.INVRX bit and the UART3_nMOD.INVTX bit, respectively, to 1.
Note:
Unless otherwise specified, this chapter shows input/output signals with non-inverted wave-
forms (UART3_nMOD.INVRX bit = 0, UART3_nMOD.INVTX bit =0).
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
USINn
OUT
USOUTn
IN
S1C31 UART3
External UART
Seiko Epson Corporation
13-3
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