MCP2140A-ISLASHP datasheet(7/60 Pages) MICROCHIP

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DS22050A-page 7

MCP2140A

2.0

DEVICE OPERATION

The MCP2140A serial interface and IR baud rates are

fixed at 9600 baud, given a 3.6864 MHz device clock.

2.1

Power-Up

Any time the device is powered up (Parameter D003),

the Power-Up Timer delay (Parameter 33) occurs, fol-

lowed by an Oscillator Start-up Timer (OST) delay

(Parameter 32). Once these delays complete, commu-

nication with the device may be initiated. This commu-

nication is from both the infrared transceiver’s side and

the controller’s UART interface.

2.1.1

POWER-ON AND BROWN-OUT

CONDITIONS

When any state machine is operated outside of its’

specified operating conditions, undesired operation

may occur. Application validation should be done to

determine when the system exits from either a

power-on or a brown-out conditions if the MCP2140A

requires the use of an external voltage supervisory cir-

cuit to ensure proper system operation.

2.2

Device Reset

The MCP2140A is forced into the reset state when the

RESET pin is in the low state. Once the RESET pin is

brought to a high state, the Device Reset sequence

occurs. Once the sequence completes, functional

operation begins.

2.3

Device Clocks

The MCP2140A requires a clock source to operate.

This clock source is used to eystablish the device tim-

ing, including the device “Bit Clock”.

2.3.1

CLOCK SOURCE

The clock source can be supplied by one of the

following:

• Crystal

• Resonator

• External clock

The

frequency

this

clock

source

must

3.6864 MHz (electrical specification Parameter 1A) for

device communication at 9600 baud.

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