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C8051F502-IM 参数 Datasheet PDF下载

C8051F502-IM图片预览
型号: C8051F502-IM
PDF下载: 下载PDF文件 查看货源
内容描述: 混合信号ISP功能的Flash MCU系列 [Mixed Signal ISP Flash MCU Family]
分类和应用: 微控制器和处理器外围集成电路PC时钟
文件页数/大小: 312 页 / 2813 K
品牌: SILICON [ SILICON ]
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C8051F50x-F51x  
SFR Definition 19.5. CLKMUL: Clock Multiplier  
Bit  
7
6
5
4
3
2
1
0
MULEN  
MULINIT MULRDY  
MULDIV[2:0]  
MULSEL[1:0]  
R/W  
Name  
Type  
Reset  
R/W  
0
R/W  
0
R
0
R/W  
0
0
0
0
0
SFR Address = 0x97; SFR Page = 0x0F;  
Bit  
Name  
Function  
7
MULEN  
Clock Multiplier Enable.  
0: Clock Multiplier disabled.  
1: Clock Multiplier enabled.  
6
5
MULINIT  
MULRDY  
Clock Multiplier Initialize.  
This bit is 0 when the Clock Multiplier is enabled. Once enabled, writing a 1 to this  
bit will initialize the Clock Multiplier. The MULRDY bit reads 1 when the Clock Mul-  
tiplier is stabilized.  
Clock Multiplier Ready.  
0: Clock Multiplier is not ready.  
1: Clock Multiplier is ready (PLL is locked).  
4:2 MULDIV[2:0] Clock Multiplier Output Scaling Factor.  
000: Clock Multiplier Output scaled by a factor of 1.  
001: Clock Multiplier Output scaled by a factor of 1.  
010: Clock Multiplier Output scaled by a factor of 1.  
011: Clock Multiplier Output scaled by a factor of 2/3*.  
100: Clock Multiplier Output scaled by a factor of 2/4 (1/2).  
101: Clock Multiplier Output scaled by a factor of 2/5*.  
110: Clock Multiplier Output scaled by a factor of 2/6 (1/3).  
111: Clock Multiplier Output scaled by a factor of 2/7*.  
*Note: The Clock Multiplier output duty cycle is not 50% for these settings.  
1:0 MULSEL[1:0] Clock Multiplier Input Select.  
These bits select the clock supplied to the Clock Multiplier  
Clock Multiplier Output  
MULSEL[1:0]  
Selected Input Clock  
for MULDIV[2:0] = 000b  
Internal Oscillator x 2  
00  
01  
10  
11  
Internal Oscillator  
External Oscillator  
Internal Oscillator  
External Oscillator  
External Oscillator x 2  
Internal Oscillator x 4  
External Oscillator x 4  
Notes:The maximum system clock is 50 MHz, and so the Clock Multiplier output should be scaled accordingly.   
If Internal Oscillator x 2 or External Oscillator x 2 is selected using the MULSEL bits, MULDIV[2:0] is ignored.  
Rev. 1.1  
171