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C8051F339 参数 Datasheet PDF下载

C8051F339图片预览
型号: C8051F339
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:
文件页数/大小: 234 页 / 3348 K
品牌: SILICON [ SILICON ]
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C8051F336/7/8/9  
25.3.2. Software Timer (Compare) Mode  
In Software Timer mode, the PCA counter/timer value is compared to the module's 16-bit capture/compare  
register (PCA0CPHn and PCA0CPLn). When a match occurs, the Capture/Compare Flag (CCFn) in  
PCA0CN is set to logic 1. An interrupt request is generated if the CCFn interrupt for that module is  
enabled. The CCFn bit is not automatically cleared by hardware when the CPU vectors to the interrupt ser-  
vice routine, and must be cleared by software. Setting the ECOMn and MATn bits in the PCA0CPMn regis-  
ter enables Software Timer mode.  
Important Note About Capture/Compare Registers: When writing a 16-bit value to the PCA0 Cap-  
ture/Compare registers, the low byte should always be written first. Writing to PCA0CPLn clears the  
ECOMn bit to ‘0’; writing to PCA0CPHn sets ECOMn to ‘1’.  
Write to  
0
PCA0CPLn  
ENB  
Reset  
Write to  
PCA0CPHn  
ENB  
PCA Interrupt  
1
PCA0CPMn  
P E C C M T P E  
W C A A A O W C  
M O P P T G M C  
1 M P N n n n F  
PCA0CN  
C C C C C  
F R  
C C C  
F F F  
2 1 0  
PCA0CPLn  
PCA0CPHn  
6 n n n  
n
n
x
0 0  
0 0  
x
0
1
Enable  
Match  
16-bit Comparator  
PCA  
Timebase  
PCA0L  
PCA0H  
Figure 25.5. PCA Software Timer Mode Diagram  
214  
Rev. 0.2