Serial Interfaces - Epson SCE8720C Series Hardware Manual

CARD-PCI/GX Hardware Manual

3.3.7 Serial interfaces

SCE8720C supports 2 ports of serial interfaces by 16550-compatible UART.
Signal name
(16 pins in total)
COM1CD#
COM2CD#
COM1DTR#
COM2DTR#
COM1DSR#
COM2DSR#
COM1RTS#
COM2RTS#
COM1CTS#
COM2CTS#
COM1RI#
COM2RI#
COM1TXD
COM2TXD
COM1RXD
COM2RXD
32
I/O
I Data carrier detect
Signal which indicates that the modem or data terminal has
detected the carrier.
Data terminal ready
O
Signal which indicates that SCE8720 is ready for data
transmission with respect to the modem or data terminal.
Data set ready
I
Signal which indicates that the modem or data terminal is
ready for data transmission with respect to SCE8720C..
Request to send
O
Signal which indicates that SCE8720 has transmission data
ready, and indicates a request to transmit data with respect
to the modem or data terminal.
Clear to send
I
Signal which indicates that the modem or data terminal has
become ready to receive for the SCE8720C's request to send.
Ring indicator
I
Signal which indicates that the modem or data terminal has
detected a telephone ringing signal.
Alternatively, this signal can be used in SCE8720C as a
wake-up signal from the suspend state.
Serial data transmission
O
Output pin for the asynchronous serial data.
Serial data receive
I
Input pin for the asynchronous serial data.
EPSON
Function description
Active low
Active low
Active low
Active low
Active low
Active low
Rev.A