參數(shù)資料
型號: AT89C51ID2-SLSUM
廠商: Atmel
文件頁數(shù): 46/157頁
文件大小: 0K
描述: IC 8051 MCU FLASH 64K 44PLCC
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 972
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?。?/td> 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: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
14
AT89C51ID2
4289C–8051–11/05
Oscillators
Overview
Two oscillators are available (for AT8xC51IxD2 devices only, the others part number
provide only the main high frequency oscillator):
OSCA used for high frequency: Up to 40 MHz
OSCB used for low frequency: 32.768 kHz
Several operating modes are available and programmable by software:
to switch OSCA to OSCB and vice-versa
to stop OSCA or OSCB to reduce consumption
In order to optimize the power consumption and the execution time needed for a specific
task, an internal prescaler feature has been implemented between the selected oscilla-
tor and the CPU.
Registers
Table 16. CKSEL Register (for AT8xC51Ix2 only)
CKSEL - Clock Selection Register (85h)
Reset Value = 0000 000’HSB.OSC’b (see Hardware Security Byte (HSB))
Not bit addressable
76
543
210
--
----
-
CKS
Bit
Number
Bit
Mnemonic
Description
7-
Reserved
6-
Reserved
5-
Reserved
4-
Reserved
3-
Reserved
2-
Reserved
1-
Reserved
0CKS
CPU Oscillator Select Bit: (CKS)
Cleared, CPU and peripherals connected to OSCB
Set, CPU and peripherals connected to OSCA
Programmed by hardware after a Power-up regarding Hardware Security Byte
(HSB).HSB.OSC (Default setting, OSCA selected)
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