UPSD3313D-40U6T datasheet(93/231 Pages) STMICROELECTRONICS

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uPSD33xx

The UART1 serial channel can operate in one of

four

different

modes

shown

Table

44., page 81

the

section, SERIAL

UART

INTERFACES, page 81. However, when UART1

is used for IrDA communication, UART1 must op-

erate in Mode 1 only, to be compatible with IrDA

protocol up to 115.2k bps. The IrDA interface will

support baud rates generated from Timer 1 or Tim-

er 2, just like standard UART serial communica-

tion, but with one restriction. The transmit baud

rate and receive baud rate must be the same (can-

not be different rates as is allowed by standard

UART communications).

The IrDA Interface is disabled after a reset and is

enabled by setting the IRDAEN Bit in the SFR

named IRDACON (Table 48., page 93). When

IrDA is disabled, the UART1's RxD and TxD sig-

nals will bypass the internal IrDA logic and instead

they are routed directly to the pins RxD1 and TxD1

respectively. When IrDA is enabled, the IrDA pulse

shaping logic is active and resides between

UART1 and the pins RxD1 and TxD1 as shown in

Figure 36., page 92.

Table 48. IRDACON Register Bit Definition (SFR CEh, Reset Value 0Fh)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

–

IRDAEN

PULSE

CDIV4

CDIV3

CDIV2

CDIV1

CDIV0

Details

Bit

Symbol

R/W

Definition

–

Reserved

IRDAEN

IrDA Enable

0 = IrDA Interface is disabled

1 = IrDA is enabled, UART1 outputs are disconnected from Port 1 (or

Port 4)

5PULSE

IrDA Pulse Modulation Select

0 = 1.627µs

1 = 3/16 bit time pulses

4-0

CDIV[4:0]

Specify Clock Divider (see Table 49., page 94)

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