STM8AF5268 STMicroelectronics, STM8AF5268 Datasheet - Page 67
STM8AF5268
Manufacturer Part Number
STM8AF5268
Description
STM8AF52 CAN Line
Manufacturer
STMicroelectronics
Datasheet
1.STM8AF5168.pdf
(106 pages)
Specifications of STM8AF5268
Max Fcpu
24 MHz
Program Memory
32 to 128 Kbytes Flash program; data retention 20 years at 55 °C
Data Memory
up to 2 Kbytes true data EEPROM; endurance 300 kcycles
Ram
2 Kbytes to 6 Kbytes
Advanced Control Timer
16-bit, 4 CAPCOM channels, 3 complementary outputs, dead-time insertion and flexible synchronization
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STM8AF52/62xx, STM8AF51/61xx
Table 33.
1. The oscillator needs two load capacitors, C
2. This value is the startup time, measured from the moment it is enabled (by software) until a stabilized 24 MHz oscillation is
Figure 19. HSE oscillator circuit diagram
C
t
SU(HSE)
Symbol
(C
reached. It can vary with the crystal type that is used.
L1
L1
R
/C
g
R
L
C
m
F
m
L2
* C
m
m
Resonator
(1)
(2)
L2
)/(C
C
O
HSE oscillator characteristics
HSE oscillator critical g
The crystal characteristics have to be checked with the following formula:
Equation 1
where g
Equation 2
Feedback resistor
Recommended load capacitance
Oscillator trans conductance
Startup time
L1
+ C
R
L
C
Co: Shunt capacitance (see crystal specification)
C
m
m
m
L1
L2
: Notional inductance (see crystal specification)
). If C
mcrit
: Notional resistance (see crystal specification)
: Notional capacitance (see crystal specification)
= C
Parameter
L1
can be calculated with the crystal parameters as follows:
L2
= C
= C: Grounded external capacitance
L2
C
C
, C
L1
L2
load
= C
L1
g
Resonator
and C
L1/2
m
mcrit
formula
Doc ID 14395 Rev 8
. Some oscillators have built-in load capacitors, C
L2
=
, to act as load for the crystal. The total load capacitance (C
Conditions
OSCIN
OSCOUT
stabilized
(
2
V
×
DD
—
—
—
Π
is
g
×
m
f
HSE
»
g
mcrit
)
2
×
Min
—
—
—
5
R
m
(
R
2Co
g
F
m
+
C
Typ
220
2.8
—
—
)
Current control
2
Electrical characteristics
f
HSE
L1
to core
and C
Max
20
—
—
—
L2
.
STM8A
Load
) is
67/106
mA/V
Unit
ms
kΩ
pF