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Quick Coding
1 IO Ports 2 AD Converter
3 Timers 4 Capture
5 Compare 6 PWM 7 Interval Timer and Buzzer 8 External Interrupts
9 SPI 10 UART 11 LVR 12 Watch Dog Timer
13 STOP Mode 14 HALT Mode    

11 LVR

1. Set LVR as 4.0V

; After enabling LVR in IDE, perform the following settings
;Note :The only way to modify the content of control registers located between $30 and $36 is
  set   P_LVR_Opt,CB_LVR_V40
  set   P_LVR_Opt,CB_LVR_V40

2. Set LVR as 2.5V

; After enabling LVR in IDE, perform the following settings
;Note :The only way to modify the content of control registers located between $30 and $36 is
;by double writing access with certain address.
  clr   P_LVR_Opt,CB_LVR_V40
  clr   P_LVR_Opt,CB_LVR_V40
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