EM351-RTR Ember, EM351-RTR Datasheet - Page 130

• Manufacturer Part Number: EM351-RTR
• Description: IC RF TXRX ZIGBEE 128KB 48QFN
• Manufacturer: Ember

Specifications of EM351-RTR

• 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: 48-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Other names: 636-1010-2

EM351 / EM357
Figure 9-5. Counter Timing Diagram, Update Event when TIM_ARBE = 0 (TIMx_ARR not buffered)
Figure 9-6. Counter Timing Diagram, Update Event when TIM_ARBE = 1 (TIMx_ARR buffered)
Down-Counting Mode
9.3.2.2
In down-counting mode, the counter counts from the auto-reload value (contents of the TIMx_ARR register)
down to 0, then restarts from the auto-reload value and generates a counter underflow event.
A UEV can be generated at each counter underflow, by setting the TIM_UG bit in the TIMx_EGR register, or by
using the slave mode controller. Software can disable the UEV by setting the TIM_UDIS bit in the TIMx_CR1
register, to avoid updating the shadow registers while writing new values in the buffer registers. No UEV
occurs until the TIM_UDIS bit is written to 0. However, the counter restarts from the current auto-reload
value, whereas the prescaler’s counter restarts from 0, but the prescale rate doesn’t change.
In addition, if the TIM_URS bit in the TIMx_CR1 register is set, setting the TIM_UG bit generates a UEV, but
without setting the INT_TIMUIF flag. Thus no interrupt request is sent. This avoids generating both update and
capture interrupts when clearing the counter on the capture event.
9-6
120-035X-000G
Final