參數(shù)資料
型號: AT89C51ID2-SLSUM
廠商: Atmel
文件頁數(shù): 67/157頁
文件大?。?/td> 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: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
17
AT89C51ID2
4289C–8051–11/05
Functional Block
Diagram
Figure 2. Functional Oscillator Block Diagram
Operating Modes
Reset
A hardware RESET puts the Clock generator in the following state:
The selected oscillator depends on OSC bit in Hardware Security Byte (HSB).
HSB.OSC = 1 (Oscillator A selected)
OscAEn = 1 & OscBEn = 0: OscA is running, OscB is stopped.
CKS = 1: OscA is selected for CPU.
HSB.OSC = 0 (Oscillator B selected)
OscAEn = 0 & OscBEn = 1: OscB is running, OscA is stopped.
CKS = 0: OscB is selected for CPU.
Functional Modes
Normal Modes
CPU and Peripherals clock depend on the software selection using CKCON0,
CKCON1 and CKRL registers
CKS bit in CKSEL register selects either OscA or OscB
CKRL register determines the frequency of the OscA clock.
It is always possible to switch dynamically by software from OscA to OscB, and vice
versa by changing CKS bit.
XtalA2
XtalA1
XtalB1
XtalB2
OscBEn
OscB
OscA
CLK
Idle
CPU clock
OscAEn
CKS
CKRL
Reload
8-bit
Prescaler-Divider
Reset
Peripheral Clock
1
0
:128
Sub
Clock
:2
X2
0
1
FOSCA
PERIPH
CPU
FOSCB
OSCCON
CKCON0
CKSEL
PwdOscA
PwdOscB
CKRL=0xFF?
0
1
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