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ST7P15BF1M6 Datasheet(PDF) 49 Page - STMicroelectronics |
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ST7P15BF1M6 Datasheet(HTML) 49 Page - STMicroelectronics |
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49 / 159 page  ST7LITE1xB 49/159 – select rising edge – reset the interrupt mask with the RIM instruc- tion (in cases where a pin level change could occur) 10.2.2 Output Modes Setting the DDRx bit selects output mode. Writing to the DR bits applies a digital value to the I/O through the latch. Reading the DR bits returns the previously stored value. If an OR bit is available, different output modes can be selected by software: push-pull or open- drain. Refer to I/O Port Implementation section for configuration. DR Value and Output Pin Status 10.2.3 Alternate Functions Many ST7s I/Os have one or more alternate func- tions. These may include output signals from, or input signals to, on-chip peripherals. The Device Pin Description table describes which peripheral signals can be input/output to which ports. A signal coming from an on-chip peripheral can be output on an I/O. To do this, enable the on-chip peripheral as an output (enable bit in the peripher- al’s control register). The peripheral configures the I/O as an output and takes priority over standard I/ O programming. The I/O’s state is readable by ad- dressing the corresponding I/O data register. Configuring an I/O as floating enables alternate function input. It is not recommended to configure an I/O as pull-up as this will increase current con- sumption. Before using an I/O as an alternate in- put, configure it without interrupt. Otherwise spuri- ous interrupts can occur. Configure an I/O as input floating for an on-chip peripheral signal which can be input and output. Caution: I/Os which can be configured as both an analog and digital alternate function need special atten- tion. The user must control the peripherals so that the signals do not arrive at the same time on the same pin. If an external clock is used, only the clock alternate function should be employed on that I/O pin and not the other alternate function. DR Push-Pull Open-Drain 0VOL VOL 1VOH Floating 1 |
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