TMP86CS44UG datasheet(139/172 Pages) TOSHIBA

139 / 172 page

Page 129

TMP86CS44UG

12.4 Transfer Rate

The baud rate of UART is set of UARTCR1<BRG>. The example of the baud rate are shown as follows.

When TC3 is used as the UART transfer rate (when UARTCR1<BRG> = “110”), the transfer clock and transfer

rate are determined as follows:

Transfer clock [Hz] = TC3 source clock [Hz] / TTREG3 setting value

Transfer Rate [baud] = Transfer clock [Hz] / 16

12.5 Data Sampling Method

The UART receiver keeps sampling input using the clock selected by UARTCR1<BRG> until a start bit is

detected in RXD pin input. RT clock starts detecting “L” level of the RXD pin. Once a start bit is detected, the start

bit, data bits, stop bit(s), and parity bit are sampled at three times of RT7, RT8, and RT9 during one receiver clock

interval (RT clock). (RT0 is the position where the bit supposedly starts.) Bit is determined according to majority

rule (The data are the same twice or more out of three samplings).

Figure 12-4 Data Sampling Method

Table 12-1 Transfer Rate (Example)

BRG

Source Clock

16 MHz

8 MHz

4 MHz

000

76800 [baud]

38400 [baud]

19200 [baud]

001

38400

19200

9600

010

19200

9600

4800

011

9600

4800

2400

100

4800

2400

1200

101

2400

1200

600

RT0

9 10 11 12 13 14 15 0

9 10 11

Bit 0

Start bit

Bit 0

Start bit

(a) Without noise rejection circuit

RT clock

Internal receive data

RT0

9 10 11 12 13 14 15 0

9 10 11

Bit 0

Start bit

Bit 0

Start bit

RT clock

Internal receive data

(b) With noise rejection circuit

RXD pin

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