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参数资料
| 型号： | uPSD3212 |
| 厂商： | 意法半导体 |
| 英文描述： | Flash Programmable System Device with 8032 Microcontroller Core(嵌入高速“8032微控制器核”的Flash型可编程系统器件) |
| 中文描述： | 闪存可编程系统器件与8032微控制器内核（嵌入高速“8032微控制器核”的闪存型可编程系统器件） |
| 文件页数： | 60/155页 |
| 文件大小： | 1055K |
| 代理商： | UPSD3212 |
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μPSD321X
60/155
Baud Rates.
The baud rate in Mode 0 is fixed:
Mode 0 Baud Rate = fosc / 12
The baud rate in Mode 2 depends on the value of
Bit SMOD = 0 (which is the value on reset), the
baud rate is 1/64 the oscillator frequency. If SMOD
= 1, the baud rate is 1/32 the oscillator frequency.
Mode 2 Baud Rate = (2
SMOD
/ 64) x fosc
In the μPSD321X Devices, the baud rates in
Modes 1 and 3 are determined by the Timer 1
overflow rate.
Using Timer 1 to Generate Baud Rates.
When
Timer 1 is used as the baud rate generator, the
baud rates in Modes 1 and 3 are determined by
the Timer 1 overflow rate and the value of SMOD
as follows (see:
Mode 1,3 Baud Rate = (2
SMOD
/ 32) x (Timer 1
overflow Rate)
The Timer 1 interrupt should be disabled in this ap-
plication. The Timer itself can be configured for ei-
ther “timer” or “counter” operation, and in any of its
3 running modes. In the most typical applications,
it is configured for “timer” operation, in the Auto-re-
load Mode (high nibble of TMOD = 0010B). In that
case the baud rate is given by the formula:
Mode 1,3 Baud Rate =
(2
SMOD
/ 32) x (fosc / (12 x [256 - (TH1)]))
One can achieve very low baud rates with Timer 1
by leaving the Timer 1 interrupt enabled, and con-
figuring the Timer to run as a 16-bit timer (high nib-
ble of TMOD = 0001B), and using the Timer 1
interrupt to do a 16-bit software reload. Figure 22
lists various commonly used baud rates and how
they can be obtained from Timer 1.
Using Timer/Counter 2 to Generate Baud
Rates.
In the μPSD321X Devices, Timer 2 select-
ed as the baud rate generator by setting TCLK
and/or RCLK (see Figure 22, page 53 Timer/
Counter 2 Control Register (T2CON)).
Note:
The baud rate for transmit and receive can
be simultaneously different. Setting RCLK and/or
TCLK puts Timer into its Baud Rate Generator
Mode.
The RCLK and TCLK Bits in the T2CON register
configure UART 1. The RCLK1 and TCLK1 Bits in
the PCON register configure UART 2.
The Baud Rate Generator Mode is similar to the
Auto-reload Mode, in that a roll over in TH2 causes
the Timer 2 registers to be reloaded with the 16-bit
value in registers RCAP2H and RCAP2L, which
are preset by software.
Now, the baud rates in Modes 1 and 3 are deter-
mined at Timer 2’s overflow rate as follows:
Mode 1,3 Baud Rate = Timer 2 Overflow Rate / 16
Table 45. Timer 1-Generated Commonly Used Baud Rates
Baud Rate
f
OSC
SMOD
Timer 1
C/T
Mode
Reload Value
Mode 0 Max: 1MHz
12MHz
X
X
X
X
Mode 2 Max: 375K
12MHz
1
X
X
X
Modes 1, 3: 62.5K
12MHz
1
0
2
FFh
19.2K
11.059MHz
1
0
2
FDh
9.6K
11.059MHz
0
0
2
FDh
4.8K
11.059MHz
0
0
2
FAh
2.4K
11.059MHz
0
0
2
F4h
1.2K
11.059MHz
0
0
2
E8h
137.5
11.059MHz
0
0
2
1Dh
110
6MHz
0
0
2
72h
110
12MHz
0
0
1
FEEBh
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UPSD3212A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic |
| UPSD3212A-24T6T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic |
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| UPSD3212A-40T6 | 功能描述:8位微控制器 -MCU Flash Programmable System Devices RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| UPSD3212A-40T6T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic |
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