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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7L15 датащи(PDF) 120 Page - STMicroelectronics |
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ST7L15 датащи(HTML) 120 Page - STMicroelectronics |
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120 / 138 page  ST7L15, ST7L19 120/138 ELECTRICAL CHARACTERISTICS (cont’d) 13.10 COMMUNICATION INTERFACE CHARACTERISTICS 13.10.1 SPI - Serial Peripheral Interface Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified. Refer to I/O port characteristics for more details on the input/output alternate function characteristics (SS, SCK, MOSI, MISO). Figure 96. SPI Slave Timing Diagram with CPHA = 03) Notes: 1. Data based on design simulation, not tested in production. 2. When no communication is on-going, the data output line of the SPI (MOSI in master mode, MISO in slave mode) has its alternate function capability released. In this case, the pin status depends on the I/O port configuration. 3. Measurement points are done at CMOS levels: 0.3 x VDD and 0.7 x VDD. 4. Depends on fCPU. For example, if fCPU = 8 MHz, then tCPU =1 /fCPU = 125ns and tsu(SS) = 550ns. Symbol Parameter Conditions Min Max Unit fSCK =1 / tc(SCK) SPI clock frequency Master, fCPU =8 MHz fCPU / 128 = 0.0625 fCPU /4=2 MHz Slave, fCPU =8 MHz 0 fCPU /2=4 tr(SCK) SPI clock rise and fall time See I/O port pin description tf(SCK) tsu(SS) 1) SS setup time4) Slave (4 x TCPU)+50 ns th(SS) 1) SS hold time 120 tw(SCKH) 1) SCK high and low time Master 100 tw(SCKL) 1) Slave 90 tsu(MI) 1) Data input setup time Master 100 tsu(SI) 1) Slave th(MI) 1) Data input hold time Master th(SI) 1) Slave ta(SO) 1) Data output access time Slave 0120 tdis(SO) 1) Data output disable time 240 tv(SO) 1) Data output valid time Slave (after enable edge) 120 th(SO) 1) Data output hold time 0 tv(MO) 1) Data output valid time Master (after enable edge) 120 th(MO) 1) Data output hold time 0 SS INPUT CPHA = 0 MOSI INPUT MISO OUTPUT CPHA = 0 tc(SCK) tw(SCKH) tw(SCKL) tr(SCK) tf(SCK) tv(SO) ta(SO) tsu(SI) th(SI) MSB OUT MSB IN BIT6 OUT LSB IN LSB OUT Seenote2 CPOL = 0 CPOL = 1 tsu(SS) th(SS) tdis(SO) th(SO) See note 2 BIT1 IN |
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