參數(shù)資料
型號(hào): AT89C51IC2-SLSIL
廠商: Atmel
文件頁數(shù): 23/140頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
標(biāo)準(zhǔn)包裝: 27
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
119
AT89C51IC2
4301D–8051–02/08
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
feature requires that an initial character (an uppercase U) be sent to the AT89C51IC2 to
establish the baud rate. Table 91 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 91. 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
-
OK
9600
OK
-
OK
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
38400
-
OK
57600
-
OK
-
OK
115200
-
OK
-
OK
-
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