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| 型号： | AT89LS52 |
| 厂商： | Atmel, Corp. |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| 中文描述： | 8位AVR微控制器具有8K字节的系统内可编程闪存 |
| 文件页数： | 15/39页 |
| 文件大小： | 469K |
| 代理商： | AT89LS52 |
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15
AT89LS52
2601A
–
12/01
Baud Rate
Generator
Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON (Table
2). Note that the baud rates for transmit and receive can be different if Timer 2 is used for the
receiver or transmitter and Timer 1 is used for the other function. Setting RCLK and/or TCLK
puts Timer 2 into its baud rate generator mode, as shown in Figure 4.
The baud rate generator mode is similar to the auto-reload mode, in that a rollover 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.
The baud rates in Modes 1 and 3 are determined by Timer 2
’
s overflow rate according to the
following equation.
The Timer can be configured for either timer or counter operation. In most applications, it is
configured for timer operation (CP/T2 = 0). The timer operation is different for Timer 2 when it
is used as a baud rate generator. Normally, as a timer, it increments every machine cycle (at
1/12 the oscillator frequency). As a baud rate generator, however, it increments every state
time (at 1/2 the oscillator frequency). The baud rate formula is given below.
where (RCAP2H, RCAP2L) is the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
Timer 2 as a baud rate generator is shown in Figure 4. This figure is valid only if RCLK or
TCLK = 1 in T2CON. Note that a rollover in TH2 does not set TF2 and will not generate an
interrupt. Note too, that if EXEN2 is set, a 1-to-0 transition in T2EX will set EXF2 but will not
cause a reload from (RCAP2H, RCAP2L) to (TH2, TL2). Thus, when Timer 2 is in use as a
baud rate generator, T2EX can be used as an extra external interrupt.
Note that when Timer 2 is running (TR2 = 1) as a timer in the baud rate generator mode, TH2
or TL2 should not be read from or written to. Under these conditions, the Timer is incremented
every state time, and the results of a read or write may not be accurate. The RCAP2 registers
may be read but should not be written to, because a write might overlap a reload and cause
write and/or reload errors. The timer should be turned off (clear TR2) before accessing the
Timer 2 or RCAP2 registers.
Modes 1 and 3 Baud Rates
16
-----------------------------------------------------------
=
Baud Rate
---------------------------------------
32 x [65536-RCAP2H,RCAP2L)]
-------------------------------------------------------------------------------------
=
相关PDF资料 |
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| AT89LS52-16AC | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| AT89LS52-16AI | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| AT89LS52-16JC | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| AT89LS52-16JI | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| AT89LS52-16PC | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AT89LS52-16AC | 功能描述:8位微控制器 -MCU LOW VOLTAGE 8K ISP FLASH - 16MHz 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 |
| AT89LS52-16AI | 功能描述:8位微控制器 -MCU LOW VOLTAGE 8K ISP FLASH - 16MHz 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 |
| AT89LS52-16AU | 功能描述:8位微控制器 -MCU LO-VLTG 8K ISP FLASH -16MHZ 2.7-5.5V 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 |
| AT89LS52-16AUR | 功能描述:8051 89LS Microcontroller IC 8-Bit 16MHz 8KB (8K x 8) FLASH 44-TQFP (10x10) 制造商:atmel 系列:89LS 包装:托盘 零件状态:有效 核心处理器:8051 核心尺寸:8-位 速度:16MHz 连接性:UART/USART 外设:WDT I/O 数:32 程序存储容量:8KB（8K x 8） 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:256 x 8 电压 - 电源（Vcc/Vdd）:2.7 V ~ 4 V 数据转换器:- 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 封装/外壳:44-TQFP 供应商器件封装:44-TQFP（10x10） 标准包装:160 |
| AT89LS52-16JC | 功能描述:8位微控制器 -MCU LOW VOLTAGE 8K ISP FLASH - 16MHZ 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 |
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