MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 78

• Manufacturer Part Number: MCBSTM32EXL
• Description: BOARD EVALUATION FOR STM32F103ZE
• Manufacturer: Keil

Specifications of MCBSTM32EXL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-, medium- and high-density reset and clock control (RCC)
6.2.1
78/995
1.
2.
FCLK acts as Cortex™-M3 free running clock. For more details refer to the ARM Cortex™-
M3 Technical Reference Manual.
HSE clock
The high speed external clock signal (HSE) can be generated from two possible clock
sources:
●
●
The resonator and the load capacitors have to be placed as close as possible to the
oscillator pins in order to minimize output distortion and startup stabilization time. The
loading capacitance values must be adjusted according to the selected oscillator.
Figure 9.
External source (HSE bypass)
In this mode, an external clock source must be provided. It can have a frequency of up to 25
MHz. You select this mode by setting the HSEBYP and HSEON bits in the
register
cycle has to drive the OSC_IN pin while the OSC_OUT pin should be left hi-Z. See
Crystal/Ceramic
External clock
Clock source
if the APB prescaler is 1, the timer clock frequencies are set to the same frequency as
that of the APB domain to which the timers are connected.
otherwise, they are set to twice (×2) the frequency of the APB domain to which the
timers are connected.
HSE external crystal/ceramic resonator
HSE user external clock
resonators
(RCC_CR). The external clock signal (square, sinus or triangle) with ~50% duty
HSE/ LSE clock sources
Doc ID 13902 Rev 9
C
External
source
L1
Hardware configuration
OSC_IN OSC_OUT
capacitors
Load
OSC_OUT
(HiZ)
C
L2
Clock control
Figure
RM0008
9.