SIO1007 datasheet(35/108 Pages) MICROCHIP

35 / 108 page

 2005 - 2015 Microchip Technology Inc.

DS00002020A-page 35

SIO1007

Note 10-1

HPMODE is CR29, BIT 4 (see CR29 on page 75). Refer to Figure 10-1, "Infrared Interface Block

Diagram" for HPMODE implementation.

The FAST bit is used to select between the SIR mode and FIR mode receiver, regardless of the transceiver type. If FAST

= 1, the FIR mode receiver is selected; if FAST = 0, the SIR mode receiver is selected (Table 10-2).

10.2.2

IR HALF DUPLEX TURNAROUND DELAY TIME

If the Half Duplex option is chosen there is an IR Half Duplex Time-out that constrains IRCC direction mode changes.

This time-out starts as each bit is transferred and prevents direction mode changes until the time-out expires. The timer

is restarted whenever new data arrives in the current direction mode. For example, 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 char-

acter is received. The Half Duplex Time-out is programmable from 0 to 25.5ms in 100 s increments (see CR2D on page

77).

TABLE 10-1:

FIR TRANSCEIVER MODULE-TYPE SELECT

HP Mode (Note 10-1)Function

0IR Mode

IRRX3

TABLE 10-2:

IR RX DATA PIN SELECTION

Control Signals

Inputs

FAST

HPMODE

RX1

RX2

RX1=RXD2

RX2=IRRX2

RX1=RXD2

RX2=IRRX2

RX1=IR Mode/IRRX3

RX2=IR Mode/IRRX3

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