SIO1007 datasheet(34/108 Pages) MICROCHIP

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SIO1007

DS00002020A-page 34

 2005 - 2015 Microchip Technology Inc.

10.0

INFRARED INTERFACE

The SIO1007 contains two infrared (IR) blocks: IRCC2.0 and CIRCC2. The IRCC2.0 block is an IrDA v1.2 compliant

port and the CIRCC2.0 block is a dedicated Consumer IR port.

The SIO1007 IRCC2.0 block provides a two-way wireless communications port using infrared as the transmission

medium. The IRCC2.0 block provides the following protocols: IrDA v1.2 (SIR/FIR), ASKIR, and Consumer IR. For

detailed description of the IRCC2.0 block see IRCC 2.X Block Data Sheet (Contact Microchip, unpublished) The

IRCC2.0 block implemented in the SIO1007 has a Chip ID value of 0xF2 in SCE Register, Block 3, Address 2 and con-

tains a GP Counter, Dual IR support and a 128 byte FIFO.

The SIO1007 CIRCC2.0 block provides a wireless communications port for receiving and transmitting CIR protocols. In

particular, it has special logic to recognize and decode NEC PPM and RC5 protocols. When the 8051 and the host are

both in a sleep state, the CIR block can be configured to generate a wake event when it detects a command via one of

these protocols. For detailed description of the CIRCC2.0 block see CIRCC 2.X Block Specification Revision 0.7, dated

August 26, 2004.

10.1

CIR and FIR Overview

10.1.1

IRDA SIR/FIR AND ASKIR

IrDA SIR (v1.0) specifies asynchronous serial communication at baud rates up to 115.2Kbps. Each byte is sent serially

LSB first beginning with a zero value start bit. A zero is signaled by sending a single infrared pulse at the beginning of

the serial bit time. A one is signaled by the absence of an infrared pulse during the bit time. Please refer to Section 20.0,

"Timing Diagrams" for the parameters of these pulses and the IrDA waveforms.

IrDA FIR (v1.2) includes IrDA v1.0 SIR and additionally specifies synchronous serial communications at data rates up

to 4Mbps.

Data is transferred LSB first in packets that can be up to 2048 bits in length. IrDA v1.2 includes 576Mbps and 1.152Mbps

data rates using an encoding scheme that is similar to SIR. The 4Mbps data rate uses a pulse position modulation (PPM)

technique.

The ASKIR infrared allows asynchronous serial communication at baud rates up to 19.2Kbps. Each byte is sent serially

LSB first beginning with a zero value start bit. A zero is signaled by sending a 500KHz carrier waveform for the duration

of the serial bit time. A one is signaled by the absence of carrier during the bit time. Refer to Section 20.0, "Timing Dia-

grams" for the parameters of the ASKIR waveforms.

10.1.2

CONSUMER IR

The SIO1007 Consumer IR interface is a general-purpose Amplitude Shift Keyed encoder/decoder with programmable

carrier and bit-cell rates that can emulate many popular TV Remote encoding formats; including, 38KHz PPM, NEC

PPM and RC5. The carrier frequency is programmable from 1.6MHz to 6.25KHz. The bit-cell rate range is 100KHz to

390Hz.

10.2

IRCC2.0 Infrared Interface

The IrDA v1.0 (SIR) and ASKIR formats are driven by the ACE registers found in UART2. The UART2 registers are

described in "Serial Port (UART)" section. The base address for UART2 is programmed in CR25, the UART2 Base

Address Register (see CR25 on page 74).

The IrDA V1.2 (FIR) and Consumer IR formats are driven by the SCE registers. Descriptions of these registers can be

found in the Infrared Communications Controller Specification. The Base Address for the SCE registers is programmed

in CR2B, the SCE Base Address Register (see CR2B on page 76, CR1E on page 71). The base address may be pro-

grammed when the SCE (FIR) logical device activate bit in CR3A-bit0 is cleared to 0 and no address decoding takes

place for the SCE (FIR) logical device.

10.2.1

IRCC2.0 HARDWARE INTERFACE

The IRCC2.0 IR hardware interface is shown in FIGURE 10-1: on page 36. This interface supports two types of external

FIR transceiver modules. One uses a mode pin (IR Mode) to program the data rate, while the other has a second Rx

data pin (IRRX3). These functions are selected through CR29 as shown in Table 10-1.

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