OXCB950 datasheet(39/68 Pages) ETC

39 / 68 page

Data Sheet Revision 1.1

Page 39

OXCB950

OXFORD SEMICONDUCTOR LTD.

Level 6:

CTS or RTS changed interrupt (ISR[5:0]=’100000’):

This interrupt is set whenever any of the CTS# or RTS#

pins changes state from low to high. It is cleared on an ISR

read of a level 6 interrupt.

7.6.4

Sleep Mode

For a channel to go into sleep mode, all of the following

conditions must be met:

•

Sleep mode enabled (IER[4]=1 in 650/950 modes, or

IER[5]=1 in 750 mode):

•

The transmitter is idle, i.e. the transmitter shift register

and FIFO are both empty.

•

SIN is high.

•

The receiver is idle.

•

The receiver FIFO is empty (LSR[0]=0).

•

The UART is not in loopback mode (MCR[4]=0).

•

Changes on modem input lines have been

acknowledged (i.e. MSR[3:0]=0000).

•

No interrupts are pending.

A read of IER[4] (or IER[5] if a 1 was written to that bit

instead) shows whether the power-down request was

successful. The UART will retain its programmed state

whilst in power-down mode.

The channel will automatically exit power-down mode when

any of the conditions 1 to 7 becomes false. It may be

woken manually by clearing IER[4] (or IER[5] if

the

alternate sleep mode is enabled).

Sleep mode operation is not available in IrDA mode.

7.7

Modem Interface

7.7.1

Modem Control Register ‘MCR’

MCR[0]: DTR

logic 0

⇒ Force DTR# output to inactive (high).

logic 1

⇒ Force DTR# output to active (low).

Note that DTR# can be used for automatic out-of-band flow

control when enabled using ACR[4:3] (see section 7.11.3).

MCR[1]: RTS

logic 0

⇒ Force RTS# output to inactive (high).

logic 1

⇒ Force RTS# output to active (low).

Note that RTS# can be used for automatic out-of-band flow

control when enabled using EFR[6] (see section 7.9.4).

MCR[2]: OUT1

logic 0

⇒ Force OUT1# output low when loopback mode

is disabled.

logic 1

⇒ Force OUT1# output high.

MCR[3]: OUT2/External interrupt enable

logic 0

⇒ Force OUT2# output low when loopback mode

is disabled. If INT_SEL# is low the external

interrupt is in high-impedance state when

MCR[3] is cleared. If INT_SEL# is high MCR[3]

does not affect the interrupt.

logic 1

⇒ Force OUT2# output high. If INT_SEL# is low

the external interrupt is enabled and operating

in normal active (forcing) mode when MCR[3] is

high. If INT_SEL# is high MCR[3] does not

affect the interrupt.

MCR[4]: Loopback mode

logic 0

⇒ Normal operating mode.

logic 1

⇒ Enable local loop-back mode (diagnostics).

In local loop-back mode, the transmitter output (SOUT) and

the four modem outputs (DTR#, RTS#, OUT1# and

OUT2#) are set in-active (high), and the receiver inputs

SIN, CTS#, DSR#, DCD#, and RI# are all disabled.

Internally the transmitter output is connected to the receiver

input and DTR#, RTS#, OUT1# and OUT2# are connected

to modem status inputs DSR#, CTS#, RI# and DCD#

respectively.

In this mode, the receiver and transmitter interrupts are

fully operational. The modem control interrupts are also

operational, but the interrupt sources are now the lower

four bits of the Modem Control Register instead of the four

modem status inputs. The interrupts are still controlled by

the IER.

MCR[5]: Enable XON-Any in Enhanced mode or enable

out-of-band flow control in non-Enhanced mode

650/950 (enhanced) modes:

logic 0

⇒ XON-Any is disabled.

logic 1

⇒ XON-Any is enabled.

In enhanced mode (EFR[4]=1), this bit enables the Xon-

Any operation. When Xon-Any is enabled, any received

data will be accepted as a valid XON (see in-band flow

control, section 7.9.3).

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