co661al-s Connect One Ltd., co661al-s Datasheet - Page 23

• 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.

TXDH
RXDH
-CTSH /PIBF
-RTSH/-PERR
5.2.3 Host Serial Interface Signals
iChip CO661AL-S Datasheet
Signal
Type
O
O
I
I
Pin No.
26
30
59
58
Transmit Data Host: This pin supplies asynchronous
serial transmit data to the host.
In Parallel mode, this pin is used for firmware update.
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 may transmit to the host.
When -CTSH is HIGH, the iChip 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.
When -RTSH is HIGH, iChip 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