co2128-48li-3sp Connect One Ltd., co2128-48li-3sp Datasheet - Page 35

• Manufacturer Part Number: co2128-48li-3sp
• Description: Chip? Co2064, Co2128 And Co2144 Are Full-featured Programmable Ip Communication Controller? Chips That Act As Coprocessors To Offload Security And Ip Connectivity Tasks From Any Host Processor.
• Manufacturer: Connect One Ltd.

Connect One
5.2.9 Serial Connection to Analog Modem
iChip supports a full-duplex, TTL-level serial communications link with the modem device.
Full EIA-232-D hardware flow control, including Tx, Rx, CTS, RTS, DTR, DSR lines, is
supported. It does not support the RI and CD lines.
5.2.10
Hardware flow control is supported between the host serial connection and iChip. Flow
control is programmed via the AT+iFLW command. The default flow control method is set to
―wait/continue‖ software flow control (which is similar to XON/XOFF software flow control)
between iChip and the host processor.
The hardware flow control method frees the host CPU from monitoring and handling the
software flow control. The host can program iChip to either use hardware flow control or
―wait/continue‖ software flow control. The flow control mechanism is based on the RTS/CTS
signals.
Hardware flow control is supported on iChip‘s serial and parallel (HPI) connections. The host
parallel connection has built-in hardware flow control signals as part of the interface logic.
iChip CO2064/CO2128/CO2144 Data Sheet
128-pin
26
28
24
25
27
Hardware and Software Flow Control
144-pin
H1
J1
G1
H3
H2
Table 5-4: Serial Modem Interface
Pin name
RXD0
TXD0
nDSR0
nCTS0
nDTR0
Preliminary
Function
USART0 receive data
USART0 transmit data
USART0 data set ready
USART0 clear to send
USART0 data terminal
ready
Functional Description
5-7