参数资料
型号: T89C51AC2-SLSIM
厂商: Atmel
文件页数: 51/121页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
标准包装: 27
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-LCC(J 形引线)
包装: 管件
35
A/T89C51AC2
4127H–8051–02/08
Figure 19. External Code Fetch Waveforms
Flash Memory
Architecture
A/T89C51AC2 features two on-chip Flash memories:
Flash memory FM0:
containing 32 KB of program memory (user space) organized into 128 byte pages,
Flash memory FM1:
2 KB for boot loader and Application Programming Interfaces (API).
The FM0 can be program by both parallel programming and Serial In-System-Program-
ming (ISP) whereas FM1 supports only parallel programming by programmers. The ISP
mode is detailed in the "In-System-Programming" section.
All Read/Write access operations on Flash Memory by user application are managed by
a set of API described in the "In-System-Programming" section.
Figure 20. Flash Memory Architecture
ALE
P0
P2
PSEN#
PCL
PCH
PCL
D7:0
PCH
D7:0
CPU Clock
7FFFh
32 KB
Flash memory
FM0
0000h
Hardware Security (1 byte)
Column Latches (128 Bytes)
user space
Extra Row (128 Bytes)
2 KB
Flash memory
FM1
boot space
FFFFh
F800h
FM1 mapped between F800h and
FFFFh when bit ENBOOT is set in
AUXR1 register
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