參數(shù)資料
型號: T89C51AC2-RLTIM
廠商: Atmel
文件頁數(shù): 51/121頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K 44VQFP
標(biāo)準(zhǔn)包裝: 160
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LQFP
包裝: 托盤
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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