OXCB950 datasheet(8/68 Pages) ETC

8 / 68 page

Data Sheet Revision 1.1

Page 8

OXCB950

OXFORD SEMICONDUCTOR LTD.

UART pins

Dir1

Name

Description

T_O

EXT_DATA_OUT

IrDA_Out

UART serial data output

UART IrDA data output when MCR[6] of the corresponding

channel is set in enhanced mode

T_I

EXT_DATA_IN

IrDA_In

UART serial data input

UART IrDA data input when IrDA mode is enabled (see

above)

T_I

DCD#

Active-low modem data-carrier-detect input

T_O

DTR#

485_En

Tx_Clk_Out

Active-low modem data-terminal-ready output. If automated

DTR# flow control is enabled, the DTR# pin is asserted and

deasserted if the receiver FIFO reaches or falls below the

programmed thresholds, respectively.

In RS485 half-duplex mode, the DTR# pin may be

programmed to reflect the state of the the transmitter empty

bit to automatically control the direction of the RS485

transceiver buffer (see register ACR[4:3])

Transmitter 1x clock (baud rate generator output). For

isochronous applications, the 1x (or Nx) transmitter clock

may be asserted on the DTR# pins (see register CKS[5:4])

T_O

RTS#

Active-low modem request-to-send output. If automated

RTS# flow control is enabled, the RTS# pin is deasserted

and reasserted whenever the receiver FIFO reaches or falls

below the programmed thresholds, respectively.

T_I

CTS#

Active-low modem clear-to-send input. If automated CTS#

flow control is enabled, upon deassertion of the CTS# pin,

the transmitter will complete the current character and enter

the idle mode until the CTS# pin is reasserted. Note: flow

control characters are transmitted regardless of the state of

the CTS# pin.

T_I

DSR#

Rx_Clk_In

Active-low modem data-set-ready input. If automated DSR#

flow control is enabled, upon deassertion of the DSR# pin,

the transmitter will complete the current character and enter

the idle mode until the DSR# pin is reasserted. Note: flow

control characters are transmitted regardless of the state of

the DSR# pin

External receiver clock for isochronous applications. The

Rx_Clk_In is selected when CKS[1:0] = ‘01’.

T_I

RI#

Tx_Clk_In

Active-low modem Ring-Indicator input

External transmitter clock. This clock can be used by the

transmitter (and indirectly by the receiver) when CKS[6]=’1’.

XTLO

Crystal oscillator output

XTLI

Crystal oscillator input (10MHz – 40 MHz) or external clock

pin. Maximum frequency 60MHz

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