ST10F273M-4T3 STMicroelectronics, ST10F273M-4T3 Datasheet - Page 156

• Manufacturer Part Number: ST10F273M-4T3
• Description: MCU 16BIT 512K FLASH 144-LQFP
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10F273M-4T3

• Core Processor: ST10
• Core Size: 16-Bit
• Speed: 40MHz
• Connectivity: ASC, CAN, EBI/EMI, I²C, SSC, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 111
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 36K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 24x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 144-MQFP, 144-PQFP
• Processor Series: ST10F27x
• Core: ST10
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Electrical characteristics
24.8.13
Note:
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External clock drive XTAL1
When Direct Drive configuration is selected during reset, it is possible to drive the CPU clock
directly from the XTAL1 pin, without particular restrictions on the maximum frequency, since
the on-chip oscillator amplifier is bypassed. The speed limit is imposed by internal logic that
targets a maximum CPU frequency of 40 MHz.
In all other clock configurations (Direct Drive with Prescaler or PLL usage) the on-chip
oscillator amplifier is not bypassed, so it determines the input clock speed limit. Then, when
the on-chip oscillator is enabled it is forbidden to use any external clock source different
from crystal or ceramic resonator.
Table 69.
1. The minimum value for the XTAL1 signal period shall be considered as the theoretical minimum. The real
2. 4 to 12 MHz is the input frequency range when using an external clock source. 40 MHz can be applied with
3. The input clock signal must reach the defined levels V
Figure 50. External clock drive XTAL1
When Direct Drive is selected, an external clock source can be used to drive XTAL1. The
maximum frequency of the external clock source depends on the duty cycle: when 40 MHz
is used, 50% duty cycle shall be granted (low phase = high phase = 12.5ns); when for
instance 20 MHz is used, a 25% duty cycle can be accepted (minimum phase, high or low,
again equal to 12.5ns).
XTAL1 period
High time
Low time
Rise time
Fall time
minimum value depends on the duty cycle of the input clock signal.
an external clock source only when Direct Drive mode is selected: in this case, the oscillator amplifier is
bypassed so it does not limit the input frequency.
Parameter
Warning:
(3)
(3)
(3)
(3)
External clock drive XTAL1 timing
(1)(2)
t
t
t
t
t
OSC
1
2
3
4
Direct driving on XTAL3 pin is not supported. Always use a
32 kHz crystal oscillator.
Symbol
SR
SR
SR
SR
SR
t
1
Min
25
Direct drive
f
6
6
–
–
CPU
V
IH2
= f
XTAL
Max
–
–
–
2
2
t
2
t
3
IL2
and V
Direct drive with
f
Min
CPU
10
3
3
–
–
prescaler
t
V
IH2
OSC
IL2
= f
.
XTAL
Max
250
–
–
2
2
/ 2
f
CPU
Min
100
6
6
–
–
PLL usage
= f
XTAL
t
4
ST10F273M
Max
250
–
–
2
2
x F
Unit
ns