PIC16C745 Datasheet

IC型号：
PIC16C745
PDF描述：
8-Bit CMOS Microcontrollers with USB
文件大小：
4945.69KB
PDF页数：
165页
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PIC16C745/765

11.1

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 11-1 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 F

INT

, the nearest inte-

ger value for the SPBRG register can be calculated

using the formula in Table 11-1. 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

INT

/(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.

11.1.1

SAMPLING

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

near the center of each bit time by a majority detect cir-

cuit to determine if a high or a low level is present at the

RX pin.

TABLE 11-1:

SYNC

BAUD RATE FORMULA

BRGH = 0 (Low Speed)

(Asynchronous) Baud Rate = F

INT

/(64(SPBRG+1))

(Synchronous) Baud Rate = F

INT

/(4(SPBRG+1))

BRGH = 1 (High Speed)

Baud Rate= F

INT

/(16(SPBRG+1))

TABLE 11-2:

Desired

Baud

300

1200

2400

4800

9600

19200

38400

57600

115200

230400

460800

921600

BAUD RATES FOR SYNCHRONOUS MODE

4 MHz

Actual

Baud

铮?/div>

4807.69

9615.38

19230.77

38461.54

58823.53

125000.00

250000.00

500000.00

铮?/div>

6 MHz

SPBRG

Actual

Baud

铮?/div>

9615.38

19230.77

38461.54

57692.31

115384.62

250000.00

500000.00

铮?/div>

24 MHz

SPBRG

Actual

Baud

铮?/div>

38461.54

57692.31

115384.62

230769.23

461538.46

% of

Error

铮?/div>

0.16

2.12

8.51

铮?/div>

% of

Error

铮?/div>

0.16

8.51

铮?/div>

% of

Error

铮?/div>

0.16

8.51

SPBRG

铮?/div>

155

103

铮?/div>

207

103

铮?/div>

155

铮?/div>

1000000.00

漏

1999 Microchip Technology Inc.

Advanced Information

DS41124A-page 77

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