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SN8F2280 参数 Datasheet PDF下载

SN8F2280图片预览
型号: SN8F2280
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器 [8-Bit Micro-Controller]
分类和应用: 微控制器
文件页数/大小: 163 页 / 3660 K
品牌: SONIX [ SONIX TECHNOLOGY COMPANY ]
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SN8F2280 Series  
USB 2.0 Full-Speed 8-Bit Micro-Controller  
13.6.4 General Call Address  
In MSP bus, the first 7-byte is the Slave address. Only the address match MSPADR the Slave will response an ACK_.  
The exception is the general call address which can address all slave devices. When this address occur, all devices  
should response an acknowledge.  
The general call address is a special address which is reserved as all “0” of 7-bits address. The general call address  
function is control by GCEN bit. Set this bit will enable general call address and clear it will disable. When GCEN=1,  
following a START signal, 8-bit will shift into MSPSR and the address is compared with MSPADR and also the general  
call address which fixed by hardware.  
If the general call address matches, the MSPSR data is transferred into MSPBUF, the BF flag bit is set, and in the  
falling edge of the ninth clock (ACK_) MSPIRQ flag set for interrupt request. In the interrupt service routine, reading  
MSPBUF can check if the address is the general call address or device specific.  
General Call Address Timing Diagram  
13.6.5 Slave Wake up  
When MCU enter Power down mode, if MSPENB bit is still set, MCU can wake-up by matched device address.  
The address of MSP bus following START bit, 8-bits address will shift into MSPSR, if address matched, an NOT  
Acknowledge will response on the ninth clock of SCL and MCU will be wake-up, MSPWK set and start wake-up  
procedure but MSPIRQ will not set and MSPSR data will not load to MSPUBF. After MCU finish wake-up procedure,  
MSP will be in idle status and waiting master’s START signal. Control register BF, MSPIRQ, MSPOV and MSPBUF will  
be the same status/data before power down.  
If address not matches, a NOT acknowledge is still sent on the ninth clock of SCL, but MCU will be NOT wake-up and  
still keep in power down mode.  
MSP Wake-up Timing Diagram: Address NOT Matched  
SONiX TECHNOLOGY CO., LTD  
Page 140  
Version 1.1  
 
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