参数资料
型号: AT89C51ED2-SLSUM
厂商: Atmel
文件页数: 35/137页
文件大小: 0K
描述: IC 8051 MCU FLASH 64K 44PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 972
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
EEPROM 大小: 2K x 8
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: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
13
4235K–8051–05/08
AT89C51RD2/ED2
ALE/PRO
G
33
27
68
56
O (I)
Address Latch Enable/Program Pulse: Output pulse for latching the
low byte of the address during an access to external memory. In normal
operation, ALE is emitted at a constant rate of 1/6 (1/3 in X2 mode) the
oscillator frequency, and can be used for external timing or clocking. Note
that one ALE pulse is skipped during each access to external data
memory. This pin is also the program pulse input (PROG) during Flash
programming. ALE can be disabled by setting SFR’s AUXR.0 bit. With
this bit set, ALE will be inactive during internal fetches.
PSEN
32
26
67
55
O
Program Strobe ENable: The read strobe to external program memory.
When executing code from the external program memory, PSEN is
activated twice each machine cycle, except that two PSEN activations
are skipped during each access to external data memory. PSEN is not
activated during fetches from internal program memory.
EA
35
29
2
58
I
External Access Enable: EA must be externally held low to enable the
device to fetch code from external program memory locations 0000H to
FFFFH. If security level 1 is programmed, EA will be internally latched on
Reset.
Table 4-1.
Pin Description (Continued)
Mnemonic
Pin Number
Type
Name and Function
PLCC44 VQFP44
PLCC68
VQFP64
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