CAM35C44 datasheet(26/50 Pages) SMSC

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TABLE 20 - SOFTWARE SELECT A REGISTER

DEFAULT

CR05

R/W

Software Select A

0x00

CR06 - Software Select B

The Software Select B register CR06 is directly

connected to the read-only IrCC 2.0 Software

Select B register in SCE Register Block Three.

Writing

CR06

the

only

way

to revise the contents of the Software Select B

CR06 can only be accessed in the

configuration state and only after the CSR has

been initialized to 06H. The default value of this

TABLE 21 - SOFTWARE SELECT B REGISTER

DEFAUL

CR06

R/W

Software Select B

0x00

CR07 - IR Half Duplex Time-Out

CR07 is the IR Half Duplex Time-Out register

(TABLE 22).

If the Half Duplex option is selected (see section

HALF DUPLEX, Bit 2 on page 24), the IR half

duplex

time-out

constrains

the

timing

transmit/receive direction mode changes in the

IrCC 2.0. The IR half duplex time-out is started

as each IR message data bit is transferred and

prevents direction mode changes until the time-

out expires.

The timer is restarted whenever

new data is transferred in the current direction

mode.

For example, in an SIR mode if data is loaded

into the transmit buffer while a character is being

received,

the

transmission

will

not

start

until the last bit has been received and the time-

out expires. If the start bit of another character

is received during this time-out, the timer is

restarted after the new character is received.

The IRCC block in the CAM35C44 also includes

an 8 bit IR half duplex time-out register, like

CR07, in SCE Register Block 5. These two

registers behave like the other IRCC legacy

controls where either source uniformly updates

the value of both registers when either register is

explicitly written using IOW or following a device-

level POR. IRCC software resets do not affect

these registers.

The IR half duplex time-out is programmable

from 0 to 25.5ms in 100

#s increments, as

follows:

IR HALF DUPLEX TIME-OUT = (CR07) x 100

####s

TABLE 22 - IR HALF DUPLEX TIME-OUT REGISTER

DEFAULT

CR07

R/W

IR HALF DUPLEX TIME-OUT

0x03

CAM35C44 Datasheet(PDF) 26 Page - SMSC Corporation

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