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ST7232A Datasheet(PDF) 136 Page - STMicroelectronics |
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ST7232A Datasheet(HTML) 136 Page - STMicroelectronics |
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136 / 157 page  ST7232A 136/157 COMMUNICATION INTERFACE CHARACTERISTICS (Cont’d) Figure 77. SPI Slave Timing Diagram with CPHA=11) Figure 78. SPI Master Timing Diagram 1) Notes: 1. Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD. 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 of the I/O port configuration. SS INPUT CPHA=1 MOSI INPUT MISO OUTPUT CPHA=1 tw(SCKH) tw(SCKL) tr(SCK) tf(SCK) ta(SO) tsu(SI) th(SI) MSB OUT BIT6 OUT LSB OUT see CPOL=0 CPOL=1 tsu(SS) th(SS) tdis(SO) th(SO) see note 2 note 2 tc(SCK) HZ tv(SO) MSB IN LSB IN BIT1 IN SS INPUT CPHA=0 MOSI OUTPUT MISO INPUT CPHA=0 CPHA=1 CPHA=1 tc(SCK) tw(SCKH) tw(SCKL) th(MI) tsu(MI) tv(MO) th(MO) MSB IN MSB OUT BIT6 IN BIT6 OUT LSB OUT LSB IN seenote2 seenote2 CPOL=0 CPOL=1 CPOL=0 CPOL=1 tr(SCK) tf(SCK) 1 |
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