參數(shù)資料
型號: AT89C51ID2-SLRIM
廠商: Atmel
文件頁數(shù): 34/157頁
文件大?。?/td> 0K
描述: IC MCU FLASH 8051 64K 5V 44-PLCC
標準包裝: 1
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: I²C,SPI,UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 2K x 8
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 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: 剪切帶 (CT)
其它名稱: AT89C51ID2SLRIMCT
129
AT89C51ID2
4289C–8051–11/05
Flow Description
Overview
An initialization step must be performed after each Reset. After microcontroller reset,
the bootloader waits for an autobaud sequence ( see section ‘a(chǎn)utobaud performance’).
When the communication is initialized the protocol depends on the record type
requested by the host.
FLIP, a software utility to implement ISP programming with a PC, is available from the
Atmel the web site.
Communication Initialization
The host initializes the communication by sending a ’U’ character to help the bootloader
to compute the baudrate (autobaud).
Figure 51. Initialization
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 AT89C51ID2 to
establish the baud rate. Table show the autobaud capability.
Host
Bootloader
"U"
Performs autobaud
Init communication
If (not received "U")
"U"
Communication opened
Else
Sends back U character
Table 95. Autobaud Performances
Frequency (MHz)
Baudrate (kHz)
1.8432
2
2.4576
3
3.6864
4
5
6
7.3728
2400
OKOKOKOKOK
OKOKOKOK
4800
OK
-
OK
9600
OK
-
OK
19200
OK
-
OKOKOK
-
OKOK
38400
-
OK
-
OK
57600
-
OK
-
OK
115200
--
OK
Frequency (MHz)
Baudrate (kHz)
8
10
11.0592
12
14.746
16
20
24
26.6
2400
OKOKOKOKOK
OKOKOKOK
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