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An example of a USART. A universal synchronous and asynchronous receiver-transmitter (USART, programmable communications interface or PCI) [1] is a type of a serial interface device that can be programmed to communicate asynchronously or synchronously.
USB; watchdog timer (WDT) multiplexed 10-bit A/D converters; D/A converters; dual clock inputs and on-line clock switching by selecting different gear values (frequency divider), thus allowing either low-power low-frequency modes or high-performance high-frequency modes; prescalable 8-bit and 16-bit timers (may be used as Programmable Interval ...
The timers support multiple capture/compares, PWM outputs, and interval timing. They also have extensive interrupt capabilities. Timer_B introduces added features such as programmable timer lengths (8-, 10-, 12-, or 16-bit) and double-buffered compare register updates, while Timer_D introduces a high-resolution (4 ns) mode. Watchdog (WDT+)
Intel C8253 Intel 8253 programmable interval timer. Intel 8254 has the same pinout. The Intel 8253 and 8254 are programmable interval timers (PITs), which perform timing and counting functions using three 16-bit counters. [1] The 825x family was primarily designed for the Intel 8080/8085-processors, but were later used in x86 compatible systems.
Timers column - more recent families have wider timers and may allow chaining two 16-bit timers to do 32-bit capture. RTT is a 16-bit Real Time Timer that is driven by a 32.768KHz clock, though Microchip calls it RTC for Real Time Counter (easily confused to mean Real Time Clock).
The Intel 8253 PIT was the original timing device used on IBM PC compatibles.It used a 1.193182 MHz clock signal (one third of the color burst frequency used by NTSC, one twelfth of the system clock crystal oscillator, [1] therefore one quarter of the 4.77 MHz CPU clock) and contains three timers.
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