參數(shù)資料
型號: AT89C51ID2-SLRUM
廠商: Atmel
文件頁數(shù): 35/157頁
文件大?。?/td> 0K
描述: IC 8051 MCU 64K FLASH 44-PLCC
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 500
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 2K x 8
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: AT89C51ID2-SLRUMDKR
13
AT89C51ID2
4289C–8051–11/05
12
6
I/O
SDA (PI2.1): 2-wire Serial Data
SDA is the bidirectional 2-wire data line
RST
10
4
I
Reset: A high on this pin for two machine cycles while the oscillator is running, resets the
device. An internal diffused resistor to V
SS permits a power-on reset using only an external
capacitor to V
CC. This pin is an output when the hardware watchdog forces a system reset.
ALE/PROG
33
27
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
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
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 pro-
grammed, EA will be internally latched on Reset.
Table 15. Pin Description (Continued)
Mnemonic
Pin Number
Type
Name and Function
PLCC44
VQFP44
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