EM357-RTR Ember, EM357-RTR Datasheet - Page 38

• 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

EM351 / EM357
identification of the peripheral is captured for later debugging. Note that only peripherals capable of writing
data to RAM, such as received packet data or a received serial port character, can generate this interrupt.
5.2.3
Registers
Appendix A, Register Address Table provides a short description of all application-accessible registers within
the EM35x. Complete descriptions are provided at the end of each applicable peripheral’s description. The
registers are mapped to the system address space starting at address 0x40000000. These registers allow for
the control and configuration of the various peripherals and modules. The CPU only performs word-aligned
accesses on the system bus. The CPU performs a word aligned read-modify-write for all byte, half-word, and
unaligned writes and a word-aligned read for all reads. Ember recommends accessing all peripheral registers
using word-aligned addressing.
As with the RAM, the peripheral registers fall within an address range that allows for bit-band access by the
TM
®
ARM
Cortex
-M3, but the standard MPU configuration does not allow access to this alias address range.
5.3
Memory Protection Unit
TM
®
The EM35x includes the ARM
Cortex
-M3 Memory Protection Unit, or MPU. The MPU controls access rights
and characteristics of up to eight address regions, each of which may be divided into eight equal sub-regions.
®
TM
Refer to the ARM
Cortex
-M3 Technical Reference Manual (DDI 0337A) for a detailed description of the MPU.
Ember software configures the MPU in a standard configuration and application software should not modify it.
The configuration is designed for optimal detection of illegal instruction or data accesses. If an illegal access
is attempted, the MPU captures information about the access type, the address being accessed, and the
location of the offending software. This simplifies software debugging and increases the reliability of deployed
devices. As a consequence of this MPU configuration, accessing RAM and register bit-band address alias regions
is not permitted, and generates a bus fault if attempted.
5-8
120-035X-000G
Final