PIC16F871 Datasheet

IC型号：
PIC16F871
PDF描述：
28/40-Pin, 8-Bit CMOS FLASH Microcontrollers
文件大小：
1755.40KB
PDF页数：
172页
芯片厂家：
Microchip

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PIC16F870/871

9.1

USART Baud Rate Generator (BRG)

The BRG supports both the asynchronous and syn-

chronous modes of the USART. It is a dedicated 8-bit

baud rate generator. The SPBRG register controls the

period of a free running 8-bit timer. In asynchronous

mode, bit BRGH (TXSTA<2>) also controls the baud

rate. In synchronous mode, bit BRGH is ignored.

Table 9-1 shows the formula for computation of the

baud rate for different USART modes which only apply

in master mode (internal clock).

Given the desired baud rate and Fosc, the nearest inte-

ger value for the SPBRG register can be calculated

using the formula in Table 9-1. From this, the error in

baud rate can be determined.

It may be advantageous to use the high baud rate

(BRGH = 1) even for slower baud clocks. This is

because the F

OSC

/(16(X + 1)) equation can reduce the

baud rate error in some cases.

Writing a new value to the SPBRG register causes the

BRG timer to be reset (or cleared). This ensures the

BRG does not wait for a timer overflow before output-

ting the new baud rate.

9.1.1

SAMPLING

The data on the RC7/RX/DT pin is sampled three times

by a majority detect circuit to determine if a high or a

low level is present at the RX pin.

TABLE 9-1:

SYNC

BAUD RATE FORMULA

BRGH = 0 (Low Speed)

(Asynchronous) Baud Rate = F

OSC

/(64(X+1))

(Synchronous) Baud Rate = F

OSC

/(4(X+1))

BRGH = 1 (High Speed)

Baud Rate= F

OSC

/(16(X+1))

X = value in SPBRG (0 to 255)

TABLE 9-2:

Address

98h

18h

99h

REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR

Name

Bit 7

CSRC

SPEN

Bit 6

TX9

RX9

Bit 5

TXEN

Bit 4

SYNC

Bit 3

鈥?/div>

ADDEN

Bit 2

BRGH

FERR

Bit 1

TRMT

Bit 0

Value on:

POR,

BOR

Value on all

other

resets

TXSTA

RCSTA

TX9D

0000 -010 0000 -010

0000 0000

SREN CREN

OERR RX9D

0000 000x 0000 000x

SPBRG Baud Rate Generator Register

Legend:

= unknown,

= unimplemented read as '0'. Shaded cells are not used by the BRG.

漏

1999 Microchip Technology Inc.

Preliminary

DS30569A-page 65

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