EM3591-RTR datasheet(28/59 Pages) SILABS

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EM359x

Rev 1.0

The EM359x integrates an ARM® CortexTM-M3 microprocessor, revision r1p1. This industry-leading core provides

32-bit performance and is very power-efficient. It has excellent code density using the ARM® Thumb-2 instruction

set. The processor can be operated at 12 or 24 MHz when using the high-frequency crystal oscillator, or at 6 MHz

or 12 MHz when using the high-frequency internal RC oscillator.

EM359x parts have either 256 or 512 kB of flash memory and either 32 or 64 kB of RAM on-chip, and the ARM

configurable memory protection unit (MPU).

The EM359x implements both the ARM Serial Wire and JTAG debug interfaces. These interfaces provide real

time, non-intrusive programming and debugging capabilities. Serial Wire and JTAG provide the same functionality,

but are mutually exclusive. The Serial Wire interface uses two pins; the JTAG interface uses five. Serial Wire is

preferred, since it uses fewer pins.

The EM359x contains the ARM® Embedded Trace Macrocell (ETM) to provide advanced real time software

debugging features for complex systems.

The EM359x contains 32 GPIO pins shared with other peripheral or alternate functions. Because of flexible routing

within the EM359x, external devices can use the alternate functions on a variety of different GPIOs. The integrated

serial controllers SC1 and SC3 can be configured for SPI (master or slave), TWI (master-only), or UART operation,

and the serial controllers SC2 and SC4 can be configured for SPI (master or slave) or TWI (master-only) operation.

The EM359x has an optional integrated USB 2.0-compliant, full-speed (12 Mbps) device peripheral, with an on-

chip transceiver. It is available on GPIO pins.

The EM359x has a general purpose ADC which can sample analog signals from six GPIO pins in single-ended or

differential modes. It can also sample the 1.8 V regulated supply VDD_PADSA, the voltage reference VREF, and

GND. The ADC has one voltage range: 0 V to 1.2 V (normal). The ADC has a DMA mode to capture samples and

automatically transfer them into RAM. The integrated voltage reference for the ADC, VREF, can be made available

to external circuitry. An external voltage reference can also be driven into the ADC. The regulator input voltage,

VDD_PADS, cannot be measured using the general purpose ADC, but it can be measured through Ember

software.

The EM359x contains four oscillators: a high-frequency 24 MHz external crystal oscillator, a high-frequency 12

MHz internal RC oscillator, an optional low-frequency 32.768 kHz external crystal oscillator, and a low-frequency

10 kHz internal RC oscillator.

The EM359x has an ultra low power, deep sleep state with a choice of clocking modes. The sleep timer can be

clocked with either the external 32.768 kHz crystal oscillator or with a 1 kHz clock derived from the internal 10 kHz

RC oscillator. Alternatively, all clocks can be disabled for the lowest power mode. In the lowest power mode, only

external events on GPIO pins will wake up the chip. The EM359x has a fast startup time (typically 110 µs) from

deep sleep to the execution of the first ARM® CortexTM-M3 instruction.

The EM359x contains three power domains. The always-on high voltage supply powers the GPIO pads and critical

chip functions. Regulated low voltage supplies power the rest of the chip. The low voltage supplies are disabled

during deep sleep to reduce power consumption. Integrated voltage regulators generate regulated 1.25 V and 1.8

V voltages from an unregulated supply voltage. The 1.8 V regulator output is decoupled and routed externally to

supply analog blocks, RAM, and flash memories. The 1.25 V regulator output is decoupled externally and supplies

the core logic.

The following sections summarize features of the EM359x that are addressed in more detail in the Ember EM359x

Reference Manual

4.1. Microprocessor and Memory

Refer to chapter 2 in the Ember EM359x Reference Manual for more information.

4.1.1. ARM® Cortex™-M3 Microprocessor

The EM359x integrates the ARM® CortexTM-M3 microprocessor, revision r1p1, developed by ARM Ltd., making

the EM359x a true System-on-Chip solution. The ARM® CortexTM-M3 is an advanced 32-bit modified Harvard

architecture processor that has separate internal program and data buses, but presents a unified program and data

address space to software.

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