參數(shù)資料
型號: TMP90C051
廠商: Toshiba Corporation
元件分類: 通用總線功能
英文描述: High Speed CMOS 8-bit Microcontroller,Integrating DMA, DRAM Controller,Serial Interface, Timer/Event Counter(高速 CMOS 8位微控制器(芯片集成了DMA,DRAM控制器,串行接口,定時器/事件計數(shù)器))
中文描述: 高速CMOS 8位微控制器,集成的DMA,DRAM控制器,串行接口,定時器/事件計數(shù)器(高速的CMOS 8位微控制器(DMA的芯片集成了,內(nèi)存控制器,串行接口,定時器/事件計數(shù)器))
文件頁數(shù): 103/158頁
文件大?。?/td> 4573K
代理商: TMP90C051
TOSHIBA CORPORATION
103/184
TMP90C051
Baud rate generator
The baud rate generator is a circuit that generates the
transmit/receive clocks that determine the transfer
speed of the serial channels.
T0 (fc/4), T2 (fc/16), T8 (fc/64) and T32 (fc/256)
from the 9-bit prescaler also used as a timer are used
as the baud rate generator input clocks. The input
clocks are selected by setting bits 5 and 4 (BG1, 0) of
the baud rate generator control register BRGCR.
The baud rate generator has a built-in 4-bit divider.
This divider determines the transfer speed by dividing
by 2 ~ 16.
Next is the method used to calculate the baud rate
when the baud rate generator is used.
UART mode
Input/output interface mode
The relationship to the input clock fundamental clock
(fc) is as follows.
T0 = fc/4
T2 = fc/16
T8 = fc/64
T32= fc/256
Consequently, with a fundamental clock of fc =
12.288MHz, input clock T2 (fc/16), and divider value
of 5, the UART mode baud rate is as follows.
= 12.288 x 10
6
÷
16
÷
5
÷
16 = 9600 (bps)
Table 3.9 (1) shows a typical UART mode baud rate.
The serial channel baud rate can also be determined
using the 8-bit timer 2. Table 3.9 (2) shows a typical baud rate
determined using timer 2.
Table 3.9 (1) Baud Rate Selection (1) (Using the Baud Rate Generator) Unit: Kbps
FC
Input clock
T0
(fc/4)
T2
(fc/16)
T8
(fc/64)
T32
(fc/256)
Divide value
9.8304MHz
2457.6
614.4
153.6
38.4
2
76.8
19.2
4.8
1.2
4
38.4
9.6
2.4
0.6
8
19.2
4.8
1.2
0.3
16
9.6
2.4
0.6
0.15
12.288MHz
3072.0
786.0
192.0
48.0
5
38.4
9.6
2.4
0.6
10
19.2
4.8
1.2
0.3
14.7456MHz
3686.4
921.6
230.4
57.6
3
76.8
19.2
4.8
1.2
6
38.4
9.6
2.4
0.6
12
19.2
4.8
1.2
0.3
相關PDF資料
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