TMP89FS60 datasheet(235/410 Pages) TOSHIBA

235 / 410 page

Page 221

TMP89FS60

RA001

16.9 Data Sampling Method

The UART receive control circuit starts RT clock counting when it detects a falling edge of the input pulses to the

RXD0 pin. 15 to 17 RT clocks are counted per bit and each clock is expressed as RTn (n=16 to 0). In a bit that has 17

RT clocks, RT16 to RT0 are counted. In a bit that has 16 RT clocks, RT15 to RT0 are counted. In a bit that has 15 RT

clocks, RT14 to RT0 are counted (Decrement). During counting of RT8 to RT6, the UART receive control circuit

samples the input pulses to the RXD0 pin to make a majority decision. The same level detected twice or more from

among three samplings is processed as the data for the bit.

The number of RT clocks can be changed in a range of 15 to 17 by setting UART0CR2<RTSEL>. However, sam-

pling is always executed in RT8 to RT6, even if the number of RT clocks is changed (Figure 16-7).

Figure 16-7 Data Sampling in Each Case of UARTCR2<RTSEL>

RT15 14 13 12 11 10 9

0 16 15 14 13 12 11 10 9

0 15 14

Bit 0

Start Bit

Bit 0

Start Bit

(b) UARTCR2<RTSEL> is “001B”

RT clock

Internal received

data

RT15 14 13 12 11 10 9

15 14 13

Bit 0

Start Bit

Bit 0

Start Bit

(a) UARTCR2<RTSEL> is “000B”

RT clock

RXD0 pin

Internal received

data

RT16 15 14 13 12 11 10 9

0 16 15 14 13 12 11 10 9

0 16

Bit 0

Start Bit

Bit 0

Start Bit

(e) UARTCR2<RTSEL> is “100B”

RT clock

Internal received

data

RT14 13 12 11 10 9

0 15 14 13 12 11 10 9

15 14 13 12 11 10 9

14 13 12 11

Bit 0

Start Bit

Bit 0

Start Bit

(d) UARTCR2<RTSEL> is “011B”

RT clock

Internal received

data

RT14 13 12 11 10 9

0 14 13 12 11 10 9

0 14 13 12 11 10

Bit 0

Bit 1

Start Bit

Bit 0

Start Bit

RT clock

Internal received

data

TMP89FS60 Datasheet(PDF) 235 Page - Toshiba Semiconductor

TMP89FS60 Datasheet(HTML) 235 Page - Toshiba Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL