参数资料
型号: AT89LP428-20AU
厂商: Atmel
文件页数: 130/149页
文件大小: 0K
描述: MCU 8051 4K FLASH SPI 32TQFP
产品培训模块: MCU Product Line Introduction
标准包装: 250
系列: 89LP
核心处理器: 8051
芯体尺寸: 8-位
速度: 20MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 30
程序存储器容量: 4KB(4K x 8)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 32-TQFP
包装: 托盘
81
3654A–MICRO–8/09
AT89LP428/828
16.3
More About Mode 0
In Mode 0, the UART is configured as a 2-wire half-duplex synchronous serial interface. Serial
data enters and exits through RXD. TXD outputs the shift clock. Eight data bits are transmit-
ted/received, with the LSB first. Figure 16-1 on page 83 shows a simplified functional diagram of
the serial port in Mode 0 and associated timing. The baud rate is programmable to 1/2 or 1/4 the
oscillator frequency by setting/clearing the SMOD1 bit. However, changing SMOD1 has an
effect on the relationship between the clock and data as described below. The baud rate can
also be generated by Timer 1 by setting TB8. Table 16-4 lists the baud rate options for Mode 0.
Transmission is initiated by any instruction that uses SBUF as a destination register. The “write
to SBUF” signal also loads a “1” into the 9th position of the transmit shift register and tells the TX
Control Block to begin a transmission. The internal timing is such that one full bit slot may elapse
between “write to SBUF” and activation of SEND.
SEND transfers the output of the shift register to the alternate output function line of P3.0, and
also transfers Shift Clock to the alternate output function line of P3.1. As data bits shift out to the
right, “0”s come in from the left. When the MSB of the data byte is at the output position of the
shift register, the “1” that was initially loaded into the 9th position is just to the left of the MSB,
and all positions to the left of that contain “0”s. This condition flags the TX Control block to do
one last shift, then deactivate SEND and set TI.
Table 16-3.
Commonly Used Baud Rates Generated by Timer 2 (TPS = 0000B)
Baud Rate
f
OSC (MHz)
Timer 2
CP/RL2
C/T2
TCLK or RCLK
Reload Value
62.5K
12
0
1
FFF4H
19.2K
11.059
0
1
FFDCH
9.6K
11.059
0
1
FFB8H
4.8K
11.059
0
1
FF70H
2.4K
11.059
0
1
FEE0H
1.2K
11.059
0
1
FDC0H
137.5
11.986
0
1
EAB8H
110
6
0
1
F2AFH
110
12
0
1
E55EH
Table 16-4.
Mode 0 Baud Rates
TB8
SMOD1
Baud Rate
00
f
SYS/4
01
f
SYS/2
1
0
(Timer 1 Overflow)/4
1
(Timer 1 Overflow)/2
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AT89LP428-20JU 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V 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
AT89LP428-20MH 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V 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
AT89LP428-20PU 功能描述:8位微控制器 -MCU SingleCycle 8051 4K ISP Flash 2.4V 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
AT89LP51-20AU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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
AT89LP51-20JU 功能描述:8位微控制器 -MCU Single Cycle 8051 4K ISP FL 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