This the STM32 ticking timer, and it is the the COMTEX M3 core of a timer, normally used for accurate delay and the system clock, such as UCOS. Download research and discussion

SysTick（系统滴答定时器）\CMSIS\core_cm3.c
.........................\.....\core_cm3.h
.........................\.....\startup\arm\startup_stm32f10x_cl.s
.........................\.....\.......\...\startup_stm32f10x_hd.s
.........................\.....\.......\...\startup_stm32f10x_hd_vl.s
.........................\.....\.......\...\startup_stm32f10x_ld.s
.........................\.....\.......\...\startup_stm32f10x_ld_vl.s
.........................\.....\.......\...\startup_stm32f10x_md.s
.........................\.....\.......\...\startup_stm32f10x_md_vl.s
.........................\.....\.......\...\startup_stm32f10x_xl.s
.........................\.....\.......\gcc_ride7\startup_stm32f10x_cl.s
.........................\.....\.......\.........\startup_stm32f10x_hd.s
.........................\.....\.......\.........\startup_stm32f10x_hd_vl.s
.........................\.....\.......\.........\startup_stm32f10x_ld.s
.........................\.....\.......\.........\startup_stm32f10x_ld_vl.s
.........................\.....\.......\.........\startup_stm32f10x_md.s
.........................\.....\.......\.........\startup_stm32f10x_md_vl.s
.........................\.....\.......\.........\startup_stm32f10x_xl.s
.........................\.....\.......\iar\startup_stm32f10x_cl.s
.........................\.....\.......\...\startup_stm32f10x_hd.s
.........................\.....\.......\...\startup_stm32f10x_hd_vl.s
.........................\.....\.......\...\startup_stm32f10x_ld.s
.........................\.....\.......\...\startup_stm32f10x_ld_vl.s
.........................\.....\.......\...\startup_stm32f10x_md.s
.........................\.....\.......\...\startup_stm32f10x_md_vl.s
.........................\.....\.......\...\startup_stm32f10x_xl.s
.........................\.....\.......\TrueSTUDIO\startup_stm32f10x_cl.s
.........................\.....\.......\..........\startup_stm32f10x_hd.s
.........................\.....\.......\..........\startup_stm32f10x_hd_vl.s
.........................\.....\.......\..........\startup_stm32f10x_ld.s
.........................\.....\.......\..........\startup_stm32f10x_ld_vl.s
.........................\.....\.......\..........\startup_stm32f10x_md.s
.........................\.....\.......\..........\startup_stm32f10x_md_vl.s
.........................\.....\.......\..........\startup_stm32f10x_xl.s
.........................\.....\stm32f10x.h
.........................\.....\system_stm32f10x.c
.........................\.....\system_stm32f10x.h
.........................\FWlib\inc\misc.h
.........................\.....\...\stm32f10x_adc.h
.........................\.....\...\stm32f10x_bkp.h
.........................\.....\...\stm32f10x_can.h
.........................\.....\...\stm32f10x_cec.h
.........................\.....\...\stm32f10x_crc.h
.........................\.....\...\stm32f10x_dac.h
.........................\.....\...\stm32f10x_dbgmcu.h
.........................\.....\...\stm32f10x_dma.h
.........................\.....\...\stm32f10x_exti.h
.........................\.....\...\stm32f10x_flash.h
.........................\.....\...\stm32f10x_fsmc.h
.........................\.....\...\stm32f10x_gpio.h
.........................\.....\...\stm32f10x_i2c.h
.........................\.....\...\stm32f10x_iwdg.h
.........................\.....\...\stm32f10x_pwr.h
.........................\.....\...\stm32f10x_rcc.h
.........................\.....\...\stm32f10x_rtc.h
.........................\.....\...\stm32f10x_sdio.h
.........................\.....\...\stm32f10x_spi.h
.........................\.....\...\stm32f10x_tim.h
.........................\.....\...\stm32f10x_usart.h
.........................\.....\...\stm32f10x_wwdg.h
.........................\.....\src\misc.c
.........................\.....\...\stm32f10x_adc.c
.........................\.....\...\stm32f10x_bkp.c
.........................\.....\...\stm32f10x_can.c
.........................\.....\...\stm32f10x_cec.c
.........................\.....\...\stm32f10x_crc.c
.........................\.....\...\stm32f10x_dac.c
.........................

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