參數(shù)資料
型號： TMP90CM38
廠商： Toshiba Corporation
元件分類： 通用總線功能
英文描述： High Speed Advanced CMOS 8-bit Microcontroller,Integrating 8-Bit A/D,D/A Converter,RAM，ROM，General Serial Interface,Multifuction Timer/Event Counter，Signal Selector Circuit,PWM Output(高速、先進的 CMOS 8位微控制器（芯片集成了8位A/D，D/A轉(zhuǎn)換器,ROM，RAM，通用串行接口，多功能定時器/事件計數(shù)器,信號選擇電路，PWM輸出）)
中文描述： 采用先進的CMOS高速8位微控制器，集成8位A / D，D / A轉(zhuǎn)換，內(nèi)存，光盤，通用串行接口，Multifuction定時器/事件計數(shù)器，信號選擇器電路，PWM輸出（高速，先進的的CMOS 8位微控制器（芯片集成了8位A / D轉(zhuǎn)換，數(shù)/模轉(zhuǎn)換器，ROM和RAM內(nèi)存，通用串行接口，多功能定時器/事件計數(shù)器，信號選擇電路，脈寬調(diào)制輸出））
文件頁數(shù)： 121/172頁
文件大小： 5946K
代理商： TMP90CM38
TOSHIBA CORPORATION
121
TMP90CM38
Baud rate generator
Baud rate generator comprises of a circuit that gener-
ates transmission and receiving clocks that determine
the transfer rate of the serial channel.
The input clock to the baud rate generator, T0 (fc/4),
T2 (fc/16), T8 (fc/64), or T32 (fc/256) is generated
by the 9-bit prescaler which is shared by the timers.
One of these input clocks is selected by the baud rate
genorator control register BRGCR1 <BG11,01>.
The baud rate generator includes a 4-bit frequency
divider, which divides frequency by 2 to 16 values to
determine the transfer rate.
How to calculate a transfer rate when the baud rate
generator is used is explained below.
UART mode
The relation between the input clock and the source
clock (fc) is as follows.
T0
T2
T8
T32
= fc/4
= fc/16
= fc/64
= fc/256
Accordingly, when source clock fc is 12.288MHz,
input clock T2 (fc/16), and frequency divisor is 5, the
transfer rate in UART mode becomes as follows.
= 12.288 x 10
6
/16
/
5
/
16 = 9600 (bps)
Table 3.9 (1) shows an example of the transfer rate in
UART mode.
Also with 8-bit timer 0, the serial channel (SIO1) can get a
transfer rate. Table 3.9 (1) shows an example of baud rate
using timer 2.
Table 3.9 (1) Selection of Transfer Rate (1) (When Baud Rate Generator is Used) Unit: Kbps
Source clock
(fc)
Input clock
T0
(fc/4)
T2
(fc/16)
T8
(fc/64)
T32
(fc/256)
Frequency clock
9.8304MHz
–
2457.600
614.400
153.600
38.400
–
2
76.800
19.200
4.800
1.200
–
4
38.400
9.600
2.400
0.600
–
8
19.200
4.800
1.200
0.300
–
16
9.600
2.400
0.600
0.150
12.288MHz
–
3072.000
786.000
192.000
48.000
–
5
38.400
9.600
2.400
0.600
–
10
19.200
4.800
1.200
0.300
14.7456MHz
–
3686.400
921.600
230.400
57.600
–
3
76.800
19.200
4.800
1.200
–
6
38.400
9.600
2.400
0.600
–
12
19.200
4.800
1.200
0.300
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TMP90CM38F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TMP90CM38T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TMP90CM39F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TMP90CM39T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
TMP90CM40 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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