参数资料
型号: AT89C51RB2-SLSUM
厂商: Atmel
文件页数: 126/127页
文件大小: 0K
描述: IC 8051 MCU FLASH 16K 44PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 972
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
98
AT89C51RB2/RC2
4180E–8051–10/06
Autobaud Performances
The ISP feature allows a wide range of baud rates in the user application. It is also
adaptable to a wide range of oscillator frequencies. This is accomplished by measuring
the bit-time of a single bit in a received character. This information is then used to pro-
gram the baud rate in terms of timer counts based on the oscillator frequency. The ISP
f eature requi res that an i n i ti a l c harac te r (an upperc a s e U) be sent t o t h e
AT89C51RB2/RC2 to establish the baud rate. Table 72 shows the autobaud capability.
Command Data Stream
Protocol
All commands are sent using the same flow. Each frame sent by the host is echoed by
the bootloader.
Table 72. Autobaud Performances
Frequency (MHz)
Baudrate (bit/s)
1.8432
2
2.4576
3
3.6864
4
5
6
7.3728
8
2400
OK
4800
OK
-
OKOKOKOKOKOK
OKOK
9600
OK
-
OKOKOKOKOKOK
OKOK
19200
OK
-
OK
-
OK
38400
-
OK
-
OK
57600
----
OK
---
OK
115200
----
OK
Frequency (MHz)
Baudrate (bit/s)
10
11.0592
12
14.318
14.746
16
20
24
26.6
2400
OK
4800
OK
9600
OK
19200
OK
OKOKOKOKOKOKOK
OK
38400
-
OK
57600
-
OK
-
OKOKOKOKOK
OK
115200
-
OK
-
OK
----
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