RM0352 datasheet(125/138 Pages) STMICROELECTRONICS

номер детали	RM0352

подробное описание детали	Brain smart hub family

PDF	138 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

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DocID024647 Rev 1

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RM0352

UART (universal asynchronous receive transmit)

137

The maximum error using a 6-bit UARTFBRD register = 1/64 × 100 = 1.56%. This occurs

when m = 1, and the error is cumulative over 64 clock ticks.

Table 121 lists some typical bit rates and their corresponding divisors when UARTCLK is

7.3728MHz. These values do not use the fractional divider so the value in the UARTFBRD

Table 122 lists some required bit rates and their corresponding integer and fractional divisor

values and generated bit rates when UARTCLK is 4 MHz.

Table 121. Typical baud rates and integer divisors when UARTCLK = 7.3728 MHz

Programmed integer divisor

Bit rate (bps)

0x1

460800

0x2

230400

0x4

115200

0x6

76800

0x8

57600

0xC

38400

0x18

19200

0x20

14400

0x30

9600

0xC0

2400

0x180

1200

0x105D

110

Table 122. Integer and fractional divisors for typical baud rates when

UARTCLK = 4 MHz

Programmed

integer divisor

Programmed

fractional divisor

Required bit rate

(bps)

Generated bit

rate (bps)

Error%

0x1

0x5

230400

231911

0.656

0x2

0xB

115200

115101

0.086

0x3

0x10

76800

76923

0.160

0x6

0x21

38400

38369

0.081

0x11

0x17

14400

14401

0.007

0x68

0xB

2400

0x8E0

0x2F

110

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