PC87306 datasheet(69/110 Pages) NSC

69 / 110 page

70 Serial Infrared Wireless Communication Port (Continued)

UARTs or one UART plus one IR port simultaneously Nor-

mal (MODEM) mode implies two UARTs IR mode implies

one UART plus one IR port

The IR port is either Full Duplex or Half Duplex where

Full Duplex e Both transmitter and receiver are enabled

simultaneously

Half Duplex e The receiver input is blocked to ‘‘1’’ while

the transmitter is busy from the beginning of the start bit

till the end of the stop bit(s)

The IR port is either in Encoded mode or Non-Encoded

mode where

Encoded mode e UART2’s SOUT pin is encoded and

routed to the IRTX pin and the IRRX pin is decoded and

routed to UART2’s SIN pin

Non-Encoded mode e UART2’s SOUT pin is inverted

and routed to the IRTX pin and the IRRX is routed to

UART2’s SIN pin

When in Encoded mode the IR port’s output signal (IRTX) is

active for intervals of either 16 ms or 316 baud

Configuration of UART2 is still handled via the FER FAR

and PTR registers However SCF0 bit 3 is used instead of

PMC bit 2 for UART TRI-STATE control An additional regis-

ter the IRC (InfraRed Configuration) is provided to config-

ure the IR interface Also UART2’s IRQ mapping can be

modified using the PNP1 register

The state of UART2 pins for both modes follow

In IR mode (IRC0e1) the default values for the following

UART2 pins are

RI2 and DCD2 are 1

DSR2 and CTS2 are 0

SOUT2 is driven high (inactive)

In Normal (MODEM) mode (IRC0e0) the default value for

the IR port pins are

IRRX is 1

IRTX is driven low (inactive)

Float Control UART2 pins (except IRQ3 and IRQ4) and IR

pins IRTX and IRRX are controlled by the UART2 TRI-

STATE control bit (bit 3 of SCF0) The outputs are in TRI-

STATE and the inputs are blocked to reduce the leakage

current when the UART2 TRI-STATE control bit is 1 and

either UART2 is disabled or the PC87306 is in power-down

mode

TLC12379 – 38

FIGURE 7-1 UART2 Serial and IR Interface Block Diagram

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