EM351-MOD-RF-TG Ember, EM351-MOD-RF-TG Datasheet - Page 108
EM351-MOD-RF-TG
Manufacturer Part Number
EM351-MOD-RF-TG
Description
MODULE EM351 NO PA/LNA W/RF CONN
Manufacturer
Ember
Specifications of EM351-MOD-RF-TG
Frequency
2.4GHz
Data Rate - Maximum
250kbps
Modulation Or Protocol
802.15.4 Zigbee
Power - Output
3dBm
Sensitivity
-100dBm
Voltage - Supply
2.1 V ~ 3.6 V
Current - Receiving
26mA
Current - Transmitting
31mA
Data Interface
PCB, Surface Mount
Memory Size
128kB Flash, 12kB RAM
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
Module
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Applications
-
Other names
636-1015
- Current page: 108 of 245
- Download datasheet (12Mb)
EM351 / EM357
A DMA buffer’s end address, SCx_TXENDA/B (or SCx_RXENDA/B), can be written while the buffer is loaded or
active. This is useful for receiving messages that contain an initial byte count, since it allows software to set
the buffer end address at the last byte of the message.
As the DMA channel transfers data between the transmit or receive FIFO and a memory buffer, the DMA count
register contains the byte offset from the start of the buffer to the address of the next byte that will be
written or read. A transmit DMA channel has a single DMA count register (SCx_TXCNT) that applies to
whichever transmit buffer is active, but a receive DMA channel has two DMA count registers (SCx_RXCNTA/B),
one for each receive buffer. The DMA count register contents are preserved until the corresponding buffer, or
either buffer in the case of the transmit DMA count, is loaded, or until the DMA is reset.
The receive DMA count register may be written while the corresponding buffer is loaded. If the buffer is not
loaded, writing the DMA count register also loads the buffer while preserving the count value written. This
feature can simplify handling UART receive errors.
The DMA channel stops using a buffer and unloads it when the following is true:
(DMA buffer start address + DMA buffer count) > DMA buffer end address
Typically a transmit buffer is unloaded after all its data has been sent, and a receive buffer is unloaded after
it is filled with data, but writing to the buffer end address or buffer count registers can also cause a buffer to
unload early.
Serial controller DMA channels include additional features specific to the SPI and UART operation and are
described in those sections.
8-33
120-035X-000G
Final
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