EM357-RTR Ember, EM357-RTR Datasheet - Page 31

• Manufacturer Part Number: EM357-RTR
• Description: IC RF TXRX ZIGBEE 192KB 48QFN
• Manufacturer: Ember

Specifications of EM357-RTR

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 26mA
• Current - Transmitting: 31mA
• Data Interface: PCB, Surface Mount
• Memory Size: 192kB Flash, 12kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 636-1011-2

5
5.1
ARM
ARM
®
®
Cortex
Cortex
This chapter discusses the ARM
modules as well as the Memory Protection Unit (MPU).
The EM35x integrates the ARM
EM35x a true System-on-Chip solution. The ARM
architecture processor that has separate internal program and data buses, but presents a unified program and
data address space to software. The word width is 32 bits for both the program and data sides. The ARM
Cortex
The ARM
is preferred over 12 MHz due to improved performance for all applications and improved duty cycling for
applications using sleep modes. The 6 MHz operation can only be used when radio operations are not required
since the radio requires an accurate 12 MHz clock.
The ARM
levels. Basic protection is available without using the MPU, but normal operation uses the MPU. The MPU
allows for protecting unimplemented areas of the memory map to prevent common software bugs from
interfering with software operation. The architecture could also allow for separation of the networking stack
from the application code using a fine granularity RAM protection module. Errant writes are captured and
details are reported to the developer to assist in tracking down and fixing issues.
TM
TM
TM
-M3 Microprocessor
-M3 allows unaligned word and half-word data accesses to support efficiently-packed data structures.
®
®
-M3 and Memory Modules
Cortex
Cortex
TM
TM
-M3 clock speed is configurable to 6 MHz, 12 MHz, or 24 MHz. For normal operation 24 MHz
-M3 in the EM35x has also been enhanced to support two separate memory protection
®
®
Cortex
Cortex
TM
TM
-M3 microprocessor, revision r1p1, developed by ARM Ltd., making the
-M3 Microprocessor, and reviews the EM35x’s flash and RAM memory
Final
5-1
®
Cortex
TM
-M3 is an advanced 32-bit modified Harvard
EM351 / EM357
120-035X-000G
®