co661al-s Connect One Ltd., co661al-s Datasheet - Page 25

• Manufacturer Part Number: co661al-s
• Description: The Co661al-s Ichip? Internet Controller? Is Part Of A Family Of Intelligent Peripheral Devices That Provides Internet Connectivity Solutions To A Myriad Of Embedded Devices.
• Manufacturer: Connect One Ltd.

5.2.4 iChip Serial Modem Signals
TXDM
RXDM
-CTSM
-RTSM
-DSRM
-DTRM
-CDM
iChip CO661AL-S Datasheet
Signal
Type
O
O
O
I
I
I
I
Pin No.
29
28
27
32
65
18
66
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 to the asynchronous
modem serial port.
When this pin is not used, connect it to VCC.
Clear-to-Send Modem: -CTSH is active only when
modem hardware flow control is enabled.
When -CTSM is LOW, flow control is enabled for the
modem serial port, i.e., iChip may transmit to the
modem.
When -CTSM is HIGH, the iChip transmitter holds its
data in the serial port transmit register.
Connect -CTSM to -RTSM when not in use
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, i.e., the modem may transmit to
iChip. When -RTSM is HIGH, iChip indicates that its
receiver is busy and cannot receive data from modem.
Connect -RTSM to -CTSM when not in use.
Data Set Ready Modem: When -DSRM is LOW, it
indicates that the modem is attached and ready to
communicate with iChip.
Connect -DSRM to GND when not in use.
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.
Description
Pin Descriptions
5-8