参数资料
型号: AT89C51RD2-SLRUM
厂商: Atmel
文件页数: 137/137页
文件大小: 0K
描述: IC MCU FLASH 8051 EEP 64K 44PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 1
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: 34
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
RAM 容量: 2K 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: 标准包装
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
其它名称: AT89C51RD2-SLRUMDKR
99
4235K–8051–05/08
AT89C51RD2/ED2
24.6.3
Functional Description
Figure 24-3. Bootloader Functional Description
On the above diagram, the on-chip bootloader processes are:
ISP Communication Management
The purpose of this process is to manage the communication and its protocol between the on-
chip bootloader and a external device. The on-chip ROM implements a serial protocol (see sec-
tion “Bootloader Protocol”). This process translate serial communication frame (UART) into
Flash memory access (read, write, erase, etc.).
User Call Management
Several Application Program Interface (API) calls are available for use by an application pro-
gram to permit selective erasing and programming of Flash pages. All calls are made through a
common interface (API calls), included in the ROM bootloader. The programming functions are
selected by setting up the microcontroller’s registers before making a call to a common entry
point (0xFFF0). Results are returned in the registers. The purpose on this process is to translate
the registers values into internal Flash Memory Management.
Flash Memory Management
This process manages low level access to Flash memory (performs read and write access).
ISP Communication
Management
User
Application
Specific Protocol
Communication
Management
Flash
Memory
External Host with
Flash Memory
User Call
Management (API)
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