CMT2380F64
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Users can configure the frequency of AHB and APB (APB1 and APB2) domains through multiple prescalers. The maximum
allowable frequency of AHB domain, APB 1 domain and APB 2 domain is 48MHz.Figure 5-2 is a clock block diagram tree.
Clock Tree
HSE = High-speed external clock signal(CMT2380F64 not support)
HIS = High-speed internal clock signal
LSE= Low-speed external clock signal
LSI = Low-speed internal clock signal
HSE OSC
4-20MHz
HSI RC
8MHz
PLL
PLLCLK
LSE OSC
32.768kHz
OSC_OUT
OSC_IN
OSC32_IN
OSC32_OUT
LSI RC
30kHz
/128
LSE
LSI
RTCSEL
IWDG_CLK
RTC_CLK
PLLSRC
PREDIV &
PO STDIV
PLLMULFCT
CLKSSEN
HSE
HSI
LSI
LSE
SCLKSW
ADC 1M
Prescaler
/1/2/
…/32
HSE
HSI
ADC1MSEL
ADC_CLK 1M
FLASH_CLK
to Flash Programming
ADC PLL
Prescaler
/1/2/
…/256
AHB
Prescaler
/1/2/
…/512
SYSCLK
Max. 48MHz
ADCPLLPRES[4]
ADC HCLK
Prescaler
/1/2/
…/32
ADC_PLLCLK
ADC_HCLK
I2S_CLK
ADC_CLK
CKMOD(ADC_CTRL3)
HCLK
FCLK
CPU AHB BUS
/8
SysTick
DMA_CLK/CRC_CLK
APB1
Prescaler
/1/2/4/8/16
TIM3/TIM6
If(APB1 prescaler
= 1) x1; else x2
Max. 48MHz
PCLK1 to APB1 peripherals
TIM3/TIM6_CLK
APB2
Prescaler
/1/2/4/8/16
Max. 48MHz
PCLK2 to APB2 peripherals
TIM1/TIM8
If(APB2 prescaler
= 1) x1; else x2
TIM1/TIM8_CLK
SYSCLK
APB1_PCLK
HSI
HSE
LSI
LSE
SYSCLK
LPUART_CLK
APB1_PCLK
HSI
HSE
LSI
LSE
CMP_OUT
LPTIM_CLK
MCO
PLLCLK
HSI
HSE
LSI
LSE
SYSCLK
MCO
PLL MCOPRES
Prescaler
/2/3/4/
…/15
Figure 5-2. Clock Tree
5.4 Boot Modes
At startup, BOOT0 pin and Flash system configuration bits can be selected from one of the three boot options:
◼
Boot from FLASH Memory
◼
Boot from System Memory
◼
Boot from on-chip SRAM
The Bootloader is located in the internal system memory.
5.5 Power supply scheme
◼
VDD area
:
The voltage input range is 1.8 V~3.6 V
,
which mainly provides power input for Main Regulator, IO and
clock reset system.