參數(shù)資料
型號: AT89C51AC2-RLTUM
廠商: Atmel
文件頁數(shù): 50/121頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K 44VQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 800
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
產(chǎn)品目錄頁面: 616 (CN2011-ZH PDF)
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
34
A/T89C51AC2
4127H–8051–02/08
External Code Memory Access
Memory Interface
The external memory interface comprises the external bus (port 0 and port 2) as well as
the bus control signals (PSEN#, and ALE).
Figure 18 shows the structure of the external address bus. P0 carries address A7:0
while P2 carries address A15:8. Data D7:0 is multiplexed with A7:0 on P0. Table 18
describes the external memory interface signals.
Figure 18. External Code Memory Interface Structure
External Bus Cycles
This section describes the bus cycles the A/T89C51AC2 executes to fetch code (see
Figure 19) in the external program/code memory.
External memory cycle takes 6 CPU clock periods. This is equivalent to 12 oscillator
clock period in standard mode or 6 oscillator clock periods in X2 mode. For further infor-
mation on X2 mode see section “Clock “.
For simplicity, the accompanying figure depicts the bus cycle waveforms in idealized
form and do not provide precise timing information.
For bus cycling parameters refer to the ‘AC-DC parameters’ section.
Table 22. External Code Memory Interface Signals
Signal
Name
Type
Description
Alternate
Function
A15:8
O
Address Lines
Upper address lines for the external bus.
P2.7:0
AD7:0
I/O
Address/Data Lines
Multiplexed lower address lines and data for the external memory.
P0.7:0
ALE
O
Address Latch Enable
ALE signals indicates that valid address information are available on lines
AD7:0.
-
PSEN#
O
Program Store Enable Output
This signal is active low during external code fetch or external code read
(MOVC instruction).
-
Flash
EPROM
A/T89C51AC2
P2
P0
AD7:0
A15:8
A7:0
A15:8
D7:0
A7:0
ALE
Latch
OE
PSEN#
相關(guān)PDF資料
PDF描述
VI-B24-IY-F3 CONVERTER MOD DC/DC 48V 50W
VI-B24-IY-F2 CONVERTER MOD DC/DC 48V 50W
VI-J1Y-IX-F4 CONVERTER MOD DC/DC 3.3V 49.5W
VJ2225A561KBAAT4X CAP CER 560PF 50V 10% NP0 2225
VI-B2N-IY-F1 CONVERTER MOD DC/DC 18.5V 50W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT89C51AC2SLSUM 制造商:Adesto Technologies Corporation 功能描述:
AT89C51AC2-SLSUM 功能描述:8位微控制器 -MCU C51AC2 32K FLASHADC EEP 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
AT89C51AC3 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Enhanced 8-bit Microcontroller with 64KB Flash Memory
AT89C51AC3_04 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Microcontrollers
AT89C51AC3_05 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Enhanced 8-bit Microcontroller with 64KB Flash Memory