co661al-d Connect One Ltd., co661al-d Datasheet - Page 24

• Manufacturer Part Number: co661al-d
• Description: Co661al-d Ichip Plus? 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.

TXDH
RXDH
-CTSH /PIBF
-RTSH/-PERR
5.2.3 Host Serial Interface Signals
iChip Plus CO661AL-D Datasheet
Signal
Type
O
O
I
I
Pin No.
26
30
59
58
In Serial mode, Transmit Data Host: This pin supplies
asynchronous serial transmit data to the host.
In Parallel mode, this pin is used for firmware update.
In Serial mode, receive Data Host: This pin supplies
asynchronous serial receive data from the host.
In Parallel mode, this pin is used for firmware update.
When not used, this pin should be connected to VCC.
In Serial mode, Clear-to-Send Host: -CTSH is active
only when host hardware flow control is enabled.
When -CTSH is LOW, flow control is enabled for the
host serial port, i.e., iChip Plus may transmit to the
host.
When -CTSH is HIGH, the iChip Plus transmitter holds
its data in the serial port transmit register.
-CTSH is sampled only at the beginning of a frame
transmission. If -CTSH is raised while a character
frame is being transmitted, that frame will be
completed.
Connect -CTSH to -RTSH when not in use.
In Parallel mode, Parallel Input Buffer Full: when
HIGH, indicates that the host has sent a data byte,
which has not yet been read.
In Serial mode, Ready-to-Send Host: -RTSH is active
only when host hardware flow control is enabled.
When -RTSH is LOW, flow control is enabled for the
host serial port, i.e., the host may transmit to iChip
Plus. When -RTSH is HIGH, iChip Plus indicates that
its receiver is busy and cannot receive data from host.
Connect -RTSH to -CTSH when not in use.
In Parallel mode, Parallel Error: When LOW,
indicates to the host that an error has occurred in the
parallel interface circuit.
Description
Pin Descriptions
5-6