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| STM8S105XX Datasheet, PDF (78/127 Pages) STMicroelectronics – Access line, 16 MHz STM8S 8-bit MCU, up to 32 Kbytes Flash, integrated EEPROM,10-bit ADC, timers, UART, SPI, I²C | |||
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Electrical characteristics
STM8S105xx
(4) tSU(HSE) is the start-up time measured from the moment it is enabled (by software) to a stabilized 16
MHz oscillation is reached. This value is measured for a standard crystal resonator and it can vary
significantly with the crystal manufacturer.
Figure 20: HSE oscillator circuit diagram
Rm
Lm CO
Cm
Resonator
CL1
OSCIN
Resonator
CL2
OSCOUT
f HSE to core
RF
gm
Consumption
control
STM8
10.3.4
HSE oscillator critical g m equation
gmcrit= (2 Ã Î Ã fHSE)2 Ã Rm(2Co + C)2
Rm: Notional resistance (see crystal specification)
Lm: Notional inductance (see crystal specification)
Cm: Notional capacitance (see crystal specification)
Co: Shunt capacitance (see crystal specification)
CL1= CL2 = C: Grounded external capacitance
gm >> gmcrit
Internal clock sources and timing characteristics
Subject to general operating conditions for VDD and TA.
High speed internal RC oscillator (HSI)
Table 34: HSI oscillator characteristics
Symbol Parameter
Conditions
Min
Typ Max Unit
fHSI
Frequency
ACCHSI Accuracy of HSI
oscillator
User-trimmed with
CLK_HSITRIMR register
fcoorngdiivtieonnsV(1D)D and TA
16
MHz
1.0(2) %
78/127
DocID14771 Rev 9
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