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參數(shù)資料
型號: AT89C51IC2-SLRUM
廠商: Atmel
文件頁數(shù): 55/140頁
文件大?。?/td> 0K
描述: IC 8051 MCU 32K 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: 40MHz
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: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K 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
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
其它名稱: AT89C51IC2-SLRUMDKR
21
AT89C51IC2
4301D–8051–02/08
Enhanced Features
In comparison to the original 80C52, the AT89C51IC2 implements some new features,
which are:
The X2 option
The Dual Data Pointer
The extended RAM
The Programmable Counter Array (PCA)
The Hardware Watchdog
The SPI interface
The 2-wire interface
The 4 level interrupt priority system
The power-off flag
The Power On Reset
The ONCE mode
The ALE disabling
Some enhanced features are also located in the UART and the timer 2
X2 Feature and OSCA
Clock Generation
The AT89C51IC2 core needs only 6 clock periods per machine cycle. This feature
called ”X2” provides the following advantages:
Divide frequency crystals by 2 (cheaper crystals) while keeping same CPU power.
Save power consumption while keeping same CPU power (oscillator power saving).
Save power consumption by dividing dynamically the operating frequency by 2 in
operating and idle modes.
Increase CPU power by 2 while keeping same crystal frequency.
In order to keep the original C51 compatibility, a divider by 2 is inserted between the
XTALA1 signal and the main clock input of the core (phase generator). This divider may
be disabled by software.
Description
The clock for the whole circuit and peripherals is first divided by two before being used
by the CPU core and the peripherals.
This allows any cyclic ratio to be accepted on XTALA1 input. In X2 mode, as this divider
is bypassed, the signals on XTALA1 must have a cyclic ratio between 40 to 60%.
Figure 5. shows the clock generation block diagram.x2 bit is validated on the rising edge
of the XTALA1÷2 to avoid glitches when switching from X2 to STD mode. Figure 6.
shows the switching mode waveforms.
Figure 5. Clock Generation Diagram
XTALA1
2
CKCON0
X2
8 bit Prescaler
F
OSCA
F
XTAL
XTALA1:2
F
CLK CPU
F
CLK PERIPH
CKSEL
CKS
F
OSCB
CKRL
0
1
0
1
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