ESE 381 Lecture Notes - Lecture 9: Serial Communication, Rs-232, Baud

• School: Stony Brook University
• Department: Electrical Engineering
• Course: ESE 381
• Professor: Kenneth Short

Document Summary

There are up to six instances of the serial communication interface (sercom) peripheral in a sam microcontroller. A sercom can be configured to support a number of serial communication modes: i2c, When a sercom is configured and enabled, all of that sercom"s resources are dedicated to the selected mode. The sercom serial engine consists of a transmitter and receiver, baud-rate generator and address matching functionality. Most peripherals require at least two clocks to operate: a bus clock and a core clock. The bus clock controls the transfers between the module and the peripheral bus. The core clock runs the synchronous circuits inside the peripheral module. The peripheral bus clocks are derived from the system clock, which is the same clock that runs the processor. The peripherals are grouped into five buses: apba through apbe. Each bus has its own prescalar and clock gate for its bus clock.