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ST7232A データシート(PDF) 133 Page - STMicroelectronics |
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ST7232A データシート(HTML) 133 Page - STMicroelectronics |
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133 / 154 page  ST7232A 133/154 12.11 COMMUNICATION INTERFACE CHARACTERISTICS 12.11.1 SPI - Serial Peripheral Interface Subject to general operating conditions for VDD, fCPU, and TA unless otherwise specified. Data based on design simulation and/or characterisation results, not tested in production. 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. Refer to I/O port characteristics for more details on the input/output alternate function char- acteristics (SS, SCK, MOSI, MISO). Figure 75. SPI Slave Timing Diagram with CPHA=0 1) Notes: 1. Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD. Symbol Parameter Conditions Min Max Unit fSCK 1/tc(SCK) SPI clock frequency Master fCPU=8MHz fCPU/128 0.0625 fCPU/4 2 MHz Slave fCPU=8MHz 0 fCPU/2 4 tr(SCK) tf(SCK) SPI clock rise and fall time see I/O port pin description tsu(SS) SS setup time Slave 120 ns th(SS) SS hold time Slave 120 tw(SCKH) tw(SCKL) SCK high and low time Master Slave 100 90 tsu(MI) tsu(SI) Data input setup time Master Slave 100 100 th(MI) th(SI) Data input hold time Master Slave 100 100 ta(SO) Data output access time Slave 0 120 tdis(SO) Data output disable time Slave 240 tv(SO) Data output valid time Slave (after enable edge) 90 th(SO) Data output hold time 0 tv(MO) Data output valid time Master (before capture edge) 0.25 tCPU th(MO) Data output hold time 0.25 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 1 |
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