参数资料
型号: AT89C51ID2-SLSUM
厂商: Atmel
文件页数: 67/157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: I²C,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
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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