EM3591-RTR datasheet(33/59 Pages) SILABS

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EM359x

Rev 1.0



Compatible with Philips’ I2C-bus slave devices

The SC1 and SC3 UART supports the following features:



Flexible baud rate clock (300 bps to 921.6 kbps)



Data bits (7 or 8)



Parity bits (none, odd, or even)



Stop bits (1 or 2)



False start bit and noise filtering



Receive and transmit FIFOs



Optional RTS/CTS flow control



Receive and transmit DMA channels

Receive and transmit FIFOs allow faster data speeds using byte-at-a-time interrupts. For the highest SPI and

UART speeds, dedicated receive and transmit DMA channels reduce CPU loading and extend the allowable time

to service a serial controller interrupt.

Refer to chapter 8 in the Ember EM359x Reference Manual for more information.

4.6.3. USB

It supports up to six endpoints (in addition to the control endpoint 0). There are five endpoints that can be used as

either interrupt or bulk and one isochronous endpoint.

The USB peripheral is interfaced to the CPU through memory mapped registers for control, and DMA for data. The

USB device generates its own 48 MHz internal clock from the main 24 MHz crystal clock.

The EM359x, where applicable, fully supports USB suspend and resume modes, and meets the USB specification

suspend current of <2.5mA. It achieves this by switching the chip to run from a divided down version of the system

clock.

Refer to chapter 9 in the Ember EM359x Reference Manual for more information.

4.6.4. General Purpose Timers

Each of the EM359x’s two general-purpose timers consists of a 16-bit auto-reload counter driven by a

programmable prescaler. They may be used for a variety of purposes, including measuring the pulse lengths of

input signals (input capture) or generating output waveforms (output compare and PWM). Pulse lengths and

waveform periods can be modulated from a few microseconds to several milliseconds using the timer prescaler.

The timers are completely independent, and do not share any resources. They can be synchronized together.

The two general-purpose timers, TIM1 and TIM2, have the following features:



16-bit up, down, or up/down auto-reload counter.



Programmable prescaler to divide the counter clock by any power of two from 1 through 32768.



4 independent channels for:



Input capture



Output compare



PWM generation (edge- and center-aligned mode)



One-pulse mode output



Synchronization circuit to control the timer with external signals and to interconnect the timers.



Flexible clock source selection:



Peripheral clock (PCLK at 6 or 12 MHz)



32.768 kHz external clock (if available)



1 kHz clock



GPIO input



Interrupt generation on the following events:



Update: counter overflow/underflow, counter initialization (software or internal/external trigger)



Trigger event (counter start, stop, initialization or count by internal/external trigger)



Input capture



Output compare

EM3591-RTR 数据表(PDF) 33 Page - Silicon Laboratories

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