参数资料
型号: AT89C51AC2-RLTUM
厂商: Atmel
文件页数: 49/121页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44VQFP
产品培训模块: MCU Product Line Introduction
标准包装: 800
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 托盘
产品目录页面: 616 (CN2011-ZH PDF)
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
33
A/T89C51AC2
4127H–8051–02/08
Program/Code
Memory
The A/T89C51AC2 implement 32 KB of on-chip program/code memory. Figure 17
shows the partitioning of internal and external program/code memory spaces depending
on the product.
The Flash memory increases EPROM and ROM functionality by in-circuit electrical era-
sure and programming. Thanks to the internal charge pump, the high voltage needed for
programming or erasing Flash cells is generated on-chip using the standard VDD volt-
age. Thus, the Flash Memory can be programmed using only one voltage and allows In-
System-Programming commonly known as ISP. Hardware programming mode is also
available using specific programming tool.
Figure 17. Program/Code Memory Organization
Notes:
1. If the program executes exclusively from on-chip code memory (not from external
memory), beware of executing code from the upper byte of on-chip memory (7FFFh)
and thereby disrupt I/O Ports 0 and 2 due to external prefetch. Fetching code con-
stant from this location does not affect Ports 0 and 2.
2. Default factory programmed parts come with maximum hardware protection. Execu-
tion from external memory is not possible unless the Hardware Security Byte is
reprogrammed. See Table 26.
0000h
32 KB
7FFFh
internal
0000h
7FFFh
FFFFh
8000h
Flash
32 KB
external
memory
32 KB
external
memory
EA = 0
EA = 1
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