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STA8089FG Datasheet(PDF) 18 Page - STMicroelectronics |
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STA8089FG Datasheet(HTML) 18 Page - STMicroelectronics |
18 / 34 page ![]() General description STA8089FG 18/34 DocID027175 Rev 8 3.4.5 MTU The 2 Multi Timer Units provide access to eight interrupt generating programmable 32-bit Free-Running decrementing Counters (FRCs). The FRCs have their own clock input, allowing the counters to run from a much slower clock than the system clock. The FRC is the part of the timer that performs the counting. There are four instantiations of the FRC block in each MTU, allowing eight counts to be performed in parallel. The 32-bit counter in the FRC is split up into two 16-bit counters. 3.4.6 WDT Watchdog Timer (WDT) provides a way of recovering from software crashes. The watchdog clock is used to generate a regular interrupt (WDOGINT), depending on a programmed value. The watchdog monitors the interrupt and asserts a reset signal (WDOGRES) if the interrupt remains unserviced for the entire programmed period. You can enable or disable the watchdog unit as required. Note: Watchdog is stalled when the ARM processor is in Debug mode. 3.4.7 GPIO The GPIO block provides twelve (12) programmable inputs or outputs. Each input or output can be controlled in two modes: software mode through an APB bus interface alternate mode, where GPIO becomes a peripheral input or output line Any GPIO input can be independently enabled or disabled (masked) for interrupt generation. User can select for each GPIO which edge (rising, falling, both) will trigger an interrupt. 3.4.8 ADC 10 bit SAR ADC operating at 1.8 V analog supply. It can convert up to 2 single ended channels with analog input multiplexer at 500KSPS 3.4.9 RTC This is an always-on power domain dedicated to RTC logic (backup system) with 32 Kbyte SRAM and supplied with a dedicated voltage regulator. The RTC provides a high resolution clock which can be used for GPS. It keeps the time when the system is inactive and can be used to wake the system up when a programmed alarm time is reached. It has a clock trimming feature to compensate for the accuracy of the 32.768 kHz crystal and a secured time update. |
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