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SN250 Datasheet(PDF) 89 Page - STMicroelectronics

Part # SN250
Description  Single-chip ZigBee/802.15.4 solution
PDF  130 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SN250 Datasheet(HTML) 89 Page - STMicroelectronics

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SN250
Functional description—application modules
89/130
7.4
General purpose timers
The SN250 integrates two general-purpose, 16-bit timers—TMR1 and TMR2. Each of the
two timers contains the following features:
●
Configurable clock source
●
Counter load
●
Two output compare registers
●
Two input capture registers
●
Can be configured to do PWM
●
Up/down counting (for PWM motor drive phase correction)
●
Single shot operation mode (timer stops at zero or threshold)
Figure 9 is a block diagram of the Timer TMR1 module. Timer TMR2 is identical.
Figure 9.
Timer TMR1 block diagram
7.4.1
Clock sources
The clock source for each timer can be chosen from the main 12MHz clock, 32.768kHz
clock, 1kHz RC-Clock, or from an external source (up to 100kHz) through TMR1CLK or
TMR2CLK. After choosing the clock source (see Table 28), the frequency can be further
divided to generate the final timer cycle provided to the timer controller (see Table 29). In
addition, the clock edge (either rising or falling) for this timer clock can be selected (see
Table 30).



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