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MCU microcontroller

WL1109

1. Operating voltage range
Ø 1.8V ~ 3.6V @ 4MHz
2. Built-in oscillator
Ø BR4MHz：High accuracy 4MHz built-in OSC
(±  1%   @ VDD = 1.8 ~ 3.6V, 0 ~ 40℃, after calibration) 
(± 1.5%@ VDD = 1.8 ~ 3.6V, -10 ~ 50℃, after calibration) 
(± 2% @ VDD = 1.8 ~ 3.6V, -25 ~ 75℃, after calibration)
3. 4 kinds of clock source divider
Ø Fcpu=Fosc/1
Ø Fcpu =Fosc/2
Ø Fcpu =Fosc/4
Ø Fcpu =Fosc/8
4. Input and output ports
Ø Internal bidirectional input and output port:
PA4, PA5, PA6, PA7
Ø Built-in pull-up resistor:
PA4, PA5, PA6, PA7
Ø Key scan wake-up function: PA4, PA5, PA6, PA7
Ø Falling edge triggers the wake-up function:
PA4, PA5, PA6, PA7
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