（4）按键修改时钟（按键中断学习）
.................................\beep.dep
.................................\beep.pdb
.................................\beep.stp
.................................\BEEP.stw
.................................\BEEP.wdb
.................................\BEEP.wed
.................................\beep_Programmer
.................................\checkres.spy
.................................\Debug
.................................\.....\beep.elf
.................................\.....\beep.lkf
.................................\.....\beep.map
.................................\.....\beep.s19
.................................\.....\beep.sm8
.................................\.....\main.ls
.................................\.....\main.o
.................................\.....\stm8s_beep.ls
.................................\.....\stm8s_beep.o
.................................\.....\stm8s_clk.ls
.................................\.....\stm8s_clk.o
.................................\.....\stm8s_exti.ls
.................................\.....\stm8s_exti.o
.................................\.....\stm8s_gpio.ls
.................................\.....\stm8s_gpio.o
.................................\.....\stm8_interrupt_vector.ls
.................................\.....\stm8_interrupt_vector.o
.................................\.....\XuanWeiStm8ProgmmerConfig.xml
.................................\.....\新建文件夹
.................................\main.c
.................................\Release
.................................\.......\beep.lkf
.................................\STM8S_StdPeriph_Driver
.................................\......................\inc
.................................\......................\...\stm8s.h
.................................\......................\...\stm8s_adc1.h
.................................\......................\...\stm8s_adc2.h
.................................\......................\...\stm8s_awu.h
.................................\......................\...\stm8s_beep.h
.................................\......................\...\stm8s_can.h
.................................\......................\...\stm8s_clk.h
.................................\......................\...\stm8s_conf.h
.................................\......................\...\stm8s_exti.h
.................................\......................\...\stm8s_flash.h
.................................\......................\...\stm8s_gpio.h
.................................\......................\...\stm8s_i2c.h
.................................\......................\...\stm8s_it.h
.................................\......................\...\stm8s_itc.h
.................................\......................\...\stm8s_iwdg.h
.................................\......................\...\stm8s_rst.h
.................................\......................\...\stm8s_spi.h
.................................\......................\...\stm8s_tim1.h
.................................\......................\...\stm8s_tim2.h
.................................\......................\...\stm8s_tim3.h
.................................\......................\...\stm8s_tim4.h
.................................\......................\...\stm8s_tim5.h
.................................\......................\...\stm8s_tim6.h
.................................\......................\...\stm8s_type.h
.................................\......................\...\stm8s_uart1.h
.................................\......................\...\stm8s_uart2.h
.................................\......................\...\stm8s_uart3.h
.................................\......................\...\stm8s_wwdg.h
.................................\......................\...\stm8_tsl_conf.h
.................................\......................\src
.................................\......................\...\stm8s_adc1.c
.................................\......................\...\stm8s_adc2.c
.................................\.............