13-3
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
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 USIN
n
pin. Setting the UART3_
n
MOD.PUEN bit to 1
enables the resistor to pull up the USIN
n
pin.
13.2.4.
Output Pin Open-Drain Output Function
The USOUT
n
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_
n
MOD.OUTMD bit to 1.
13.2.5.
Input/Output Signal Inverting Function
The UART3 can invert the signal polarities of the USIN
n
pin input and the USOUT
n
pin output by
setting the UART3_
n
MOD.INVRX bit and the UART3_
n
MOD.INVTX bit, respectively, to 1.
Note:
Unless otherwise specified, this chapter shows input/output signals with non-inverted wave-
forms (UART3_
n
MOD.INVRX bit = 0, UART3_
n
MOD.INVTX bit =0).
USIN
n
USOUT
n
OUT
IN
S1C31 UART3
External UART
Summary of Contents for S1C31D50
Page 461: ...25 1 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 25 Package TQFP12 48PIN ...
Page 462: ...25 2 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP13 64PIN ...
Page 463: ...25 3 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 TQFP14 80PIN ...
Page 464: ...25 4 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP15 100PIN ...