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ST6253C Datasheet(PDF) 41 Page - STMicroelectronics |
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ST6253C Datasheet(HTML) 41 Page - STMicroelectronics |
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41 / 84 page  41/84 ST62T53C/T60C/T63C ST62E60C I/O PORTS (Cont’d) 4.1.3 AR Timer Alternate function Option When bit PWMOE of register ARMC is low, pin AR- TIMout/PB7 is configured as any standard pin of port B through the port registers. When PWMOE is high, ARTIMout/PB7 is the PWM output, independ- ently of the port registers configuration. ARTIMin/PB6 is connected to the AR Timer input. It is configured through the port registers as any standard pin of port B. To use ARTIMin/PB6 as AR Timer input, it must be configured as input through DDRB. 4.1.4 SPI Alternate function Option PC2/PC4 are used as standard I/O as long as bit SPCLK of the SPI Mode Register is kept low. When PC2/Sin is configured as input, it is automat- ically connected to the SPI shift register input, in- dependent of the state at SPCLK. PC3/SOUT is configured as SPI push-pull output by setting bit 0 of the Miscellaneous register (ad- dress DDh), regardless of the state of Port C reg- isters. PC4/SCK is configured as push-pull output clock (master mode) by programming it as push- pull output through DDRC register and by setting bit SPCLK of the SPI Mode Register. PC4/SCK is configured as input clock (slave mode) by programming it as input through DDRC register and by clearing bit SPCLK of the SPI Mode Regis- ter. With this configuration, PC4 can simultaneous- ly be used as an input. |
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