MCP2155_13 datasheet(8/52 Pages) MICROCHIP

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MCP2155

DS21690B-page 8

Preliminary

 2001-2013 Microchip Technology Inc.

2.4

Bit Clock

The device crystal is used to derive the communication

bit clock (BITCLK). There are 16 BITCLKs for each bit

time. The BITCLKs are used for the generation of the

start bit and the eight data bits. The stop bit uses the

BITCLK when the data is transmitted (not for recep-

tion).

This clock is a fixed frequency, and has minimal varia-

tion in frequency (specified by crystal manufacturer).

2.5

UART Interface

The UART interface communicates with the "control-

ler". This interface is a half duplex interface, meaning

that the system is either transmitting or receiving, but

not both at the same time.

2.5.1

BAUD RATE

The baud rate for the MCP2155 serial port (the TX and

RX pins) is configured by the state of the BAUD1 and

BAUD0 pins. These two device pins are used to select

the baud rate that the MCP2155 will transmit and

receive serial data (not IR data). Table 2-3 shows the

baud rate configurations.

TABLE 2-3:

SERIAL BAUD RATE

SELECTION VS. FREQUENCY

2.5.2

TRANSMITTING

When the controller sends serial data to the MCP2155,

the controller’s baud rate is required to match the baud

rate of the MCP2155’s serial port.

2.5.3

RECEIVING

When the controller receives serial data from the

MCP2155, the controller’s baud rate is required to

match the baud rate of the MCP2155’s serial port.

BAUD1:BAUD0

Baud Rate @

11.0592 MHz

Bit Rate

9600

FOSC / 1152

19200

FOSC / 576

57600

FOSC / 192

115200

FOSC / 96

21690B.book Page 8 Thursday, January 10, 2013 1:06 PM

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