參數(shù)資料
型號: TMP86CH09NG
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP32
封裝: 0.400 INCH, 1.78 MM PITCH, LEAD FREE, PLASTIC, SDIP-32
文件頁數(shù): 22/120頁
文件大小: 1743K
代理商: TMP86CH09NG
Page 107
TMP86FH09ANG
10.4 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
10.5 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 10-4 Data Sampling Method
Table 10-1 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
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 0
1
2
3
4
5
6
7
8
9 10 11
Bit 0
Start bit
Bit 0
Start bit
(a) Without noise rejection circuit
RT clock
Internal receive data
RT0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 0
1
2
3
4
5
6
7
8
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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