co120sq Connect One Ltd., co120sq Datasheet - Page 29

• Manufacturer Part Number: co120sq
• Description: The Ichip? Co120sq Internet Controller? Is A High-performance, Firmware-based Intelligent Peripheral Device That Provides Internet Connectivity Solutions For A Wide Range Of Embedded Devices.
• Manufacturer: Connect One Ltd.

6.3.2.3
Signal
TXDM
RXDM
-CTSM
-RTSM
-DSRM
-DTRM
-CDM
iChip CO120SQ Data Sheet
Serial Modem Signals
Type
I(PD)
I(PD)
I(PD)
O
O
O
I
Pin No.
61
62
48
60
31
5
6
Description
Transmit Data Modem: This pin provides
asynchronous serial transmit data to the modem from
the serial port.
This pin must remain HIGH on reset.
Receive Data Modem: This pin provides
asynchronous serial receive data from the modem
from the asynchronous modem serial port.
When this pin is not used, connect it to VDD.
Clear-to-Send Modem: -CTSM is active only when
modem hardware flow control is enabled.
When –CTSM is LOW, flow control is enabled for the
modem serial port. That is, iChip can transmit to the
modem.
When –CTSM is HIGH, the iChip transmitter holds its
data in the serial port transmit register.
When not used, can be left open.
Ready-to-Send Modem: -RTSM is active only when
modem hardware flow control is enabled.
When –RTSM is LOW, flow control is enabled for the
modem serial port. That is, the modem can transmit to
iChip.
When –RTSM is HIGH, iChip indicates that its
receiver is busy and cannot receive data from the
modem.
When not used, can be left open.
Data Set Ready Modem: When –DSRM is LOW, it
indicates that the modem is attached and ready to
communicate with iChip.
When not used, can be left open.
Data Terminal Ready Modem: When –DTRM is LOW,
it indicates to the modem that iChip is attached and
ready to communicate.
Carrier Detect Modem: This pin indicates to iChip that
the modem detects a carrier signal.
Pin Descriptions
6-17