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SI1005 参数 Datasheet PDF下载

SI1005图片预览
型号: SI1005
PDF下载: 下载PDF文件 查看货源
内容描述: 超低功耗, 64/32 KB , 10位ADC, MCU ,集成了240-960兆赫的EZRadioPRO收发器 [Ultra Low Power, 64/32 kB, 10-Bit ADC MCU with Integrated 240-960 MHz EZRadioPRO Transceiver]
分类和应用:
文件页数/大小: 376 页 / 2369 K
品牌: SILICON [ SILICON ]
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Si1000/1/2/3/4/5  
5. Make certain that all writes to the RSTSRC (Reset Sources) register use direct assignment operators  
and explicitly DO NOT use the bit-wise operators (such as AND or OR). For example, "RSTSRC =  
0x02" is correct, but "RSTSRC |= 0x02" is incorrect.  
6. Make certain that all writes to the RSTSRC register explicitly set the PORSF bit to a 1. Areas to check  
are initialization code which enables other reset sources, such as the Missing Clock Detector or  
Comparator, for example, and instructions which force a Software Reset. A global search on "RSTSRC"  
can quickly verify this.  
13.5.2. PSWE Maintenance  
7. Reduce the number of places in code where the PSWE bit (b0 in PSCTL) is set to a 1. There should be  
exactly one routine in code that sets PSWE to a 1 to write Flash bytes and one routine in code that sets  
both PSWE and PSEE both to a 1 to erase Flash pages.  
8. Minimize the number of variable accesses while PSWE is set to a 1. Handle pointer address updates  
and loop maintenance outside the "PSWE = 1;... PSWE = 0;" area. Code examples showing this can be  
found in “AN201: Writing to Flash from Firmware," available from the Silicon Laboratories website.  
9. Disable interrupts prior to setting PSWE to a 1 and leave them disabled until after PSWE has been  
reset to 0. Any interrupts posted during the Flash write or erase operation will be serviced in priority  
order after the Flash operation has been completed and interrupts have been re-enabled by software.  
10.Make certain that the Flash write and erase pointer variables are not located in XRAM. See your  
compiler documentation for instructions regarding how to explicitly locate variables in different memory  
areas.  
11.Add address bounds checking to the routines that write or erase Flash memory to ensure that a routine  
called with an illegal address does not result in modification of the Flash.  
13.5.3. System Clock  
12.If operating from an external crystal, be advised that crystal performance is susceptible to electrical  
interference and is sensitive to layout and to changes in temperature. If the system is operating in an  
electrically noisy environment, use the internal oscillator or use an external CMOS clock.  
13.If operating from the external oscillator, switch to the internal oscillator during Flash write or erase  
operations. The external oscillator can continue to run, and the CPU can switch back to the external  
oscillator after the Flash operation has completed.  
Additional Flash recommendations and example code can be found in “AN201: Writing to Flash from Firm-  
ware," available from the Silicon Laboratories website.  
146  
Rev. 1.0