参数资料
型号: AT89C51IC2-SLSIL
厂商: Atmel
文件页数: 52/140页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
标准包装: 27
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
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: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 3.6 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
19
AT89C51IC2
4301D–8051–02/08
Design Considerations
Oscillators Control
PwdOscA and PwdOscB signals are generated in the Clock generator and used to
control the hard blocks of oscillators A and B.
PwdOscA =’1’ stops OscA
PwdOscB =’1’ stops OscB
The following tables summarize the Operating modes:
Prescaler Divider
A hardware RESET puts the prescaler divider in the following state:
CKRL = FFh: FCLK CPU = FCLK PERIPH = FOSCA/2 (Standard C51 feature)
CKS signal selects OSCA or OSCB: FCLK OUT = FOSCA or FOSCB
Any value between FFh down to 00h can be written by software into CKRL register
in order to divide frequency of the selected oscillator:
CKRL = 00h: minimum frequency
FCLK CPU = FCLK PERIPH = FOSCA/1020 (Standard Mode)
FCLK CPU = FCLK PERIPH = FOSCA/510 (X2 Mode)
CKRL = FFh: maximum frequency
FCLK CPU = FCLK PERIPH = FOSCA/2 (Standard Mode)
FCLK CPU = FCLK PERIPH = FOSCA (X2 Mode)
0
1
X
1
IDLE MODE A
The CPU is off, OscA supplies the
peripherals, OscB can be disabled
(OscBEn = 0)
0
1
X
0
IDLE MODE B
The CPU is off, OscB supplies the
peripherals, OscA can be disabled
(OscAEn = 0)
1
X
1
X
POWER DOWN
MODE
The CPU and peripherals are off,
OscA and OscB are stopped
Table 18. Overview (Continued)
PCON.1
PCON.0
OscBEn
OscAEn
CKS
Selected Mode
Comment
PCON.1
OscAEn
PwdOscA
Comments
0
1
0
OscA running
1
X
1
OscA stopped by
Power-down mode
0
1
OscA stopped by
clearing OscAEn
PCON.1
OscBEn
PwdOscB
Comments
0
1
0
OscB running
1
X
1
OscB stopped by
Power-down mode
0
1
OscB stopped by
clearing OscBEn
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