EM3581-RTR datasheet(28/59 Pages) SILABS

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EM358x

Rev 1.0

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.

EM358x 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 EM358x 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 EM358x contains the ARM® Embedded Trace Macrocell (ETM) to provide advanced real time software

debugging features for complex systems.

The EM358x contains 24 GPIO pins shared with other peripheral or alternate functions. Because of flexible routing

within the EM358x, external devices can use the alternate functions on a variety of different GPIOs. The integrated

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

serial controller SC2 can be configured for SPI (master or slave) or TWI (master-only) operation.

The EM358x 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 EM358x 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 EM358x 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 EM358x 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 EM358x has a fast startup time (typically 110 µs) from

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

The EM358x 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.

EM358x parts are pin-compatible with the Ember EM351 and EM357 chips.

Note: The EM358x is not pin-compatible with the previous generation of Ember chip, the EM250, except for the RF section of

the chip. Pins 1-11 and 45-48 are compatible, to ease migration to the EM358x.

The following sections summarize features of the EM358x that are addressed in more detail in the

Ember EM358x

Reference Manual.

4.1. Microprocessor and Memory

Refer to chapter 2 in the

Ember EM358x Reference Manual for more information.

4.1.1. ARM® Cortex™-M3 Microprocessor

The EM358x integrates the ARM® CortexTM-M3 microprocessor, revision r1p1, developed by ARM Ltd., making

the EM358x 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

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