ST72F623F2M1 STMicroelectronics, ST72F623F2M1 Datasheet - Page 20

• Manufacturer Part Number: ST72F623F2M1
• Description: IC MCU 8BIT LS 8K 20-SOIC
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F623F2M1

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 11
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 3x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 20-SOIC (7.5mm Width)
• Processor Series: ST72F6x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 384 B
• Interface Type: SCI, SPI, USB
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 11
• Number Of Timers: 2
• Operating Supply Voltage: 4 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• On-chip Adc: 10 bit
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 497-2114-5

ST7262xxx
6 CLOCKS AND RESET
6.1 CLOCK SYSTEM
6.1.1 General Description
The MCU accepts either a Crystal or Ceramic res-
onator, or an external clock signal to drive the in-
ternal oscillator. The internal clock (f
rived from the external oscillator frequency (f
by dividing by 3 and multiplying by 2. By setting the
OSC12/6 bit in the option byte, a 12 MHz external
clock can be used giving an internal frequency of 8
MHz while maintaining a 6 MHz clock for USB (re-
fer to
The internal clock signal (f
square wave with a duty cycle of 50%.
It is further divided by 1, 2, 4 or 8 depending on the
Slow Mode Selection bits in the Miscellaneous
register (SMS[1:0])
The internal oscillator is designed to operate with
an AT-cut parallel resonant quartz or ceramic res-
onator in the frequency range specified for f
The circuit shown in
when using a crystal, and
mended capacitors. The crystal and associated
components should be mounted as close as pos-
sible to the input pins in order to minimize output
distortion and start-up stabilization time.
Table 4. Recommended Values for 12 MHz
Crystal Resonator
Note: R
crystal (see crystal specification).
Note: When a crystal is used, and to not over-
stress the crystal, ST recommends to add a serial
resistor on the OSCOUT pin to limit the drive level
in accordance with the crystal manufacturer’s
specification. Please also refer to
20/139
C
C
R
OSCOUT
OSCIN
SMAX
R
Figure
P
SMAX
14).
is the equivalent serial resistor of the
1-10 MΩ
56pF
56pF
20 Ω
Figure 13
Table 4
1-10 MΩ
47pF
47pF
25 Ω
CPU
is recommended
) consists of a
Section
lists the recom-
CPU
1-10 MΩ
22pF
22pF
70 Ω
12.5.4.
) is de-
OSC
osc
),
.
Doc ID 6996 Rev 5
6.1.2 External Clock input
An external clock may be applied to the OSCIN in-
put with the OSCOUT pin not connected, as
shown on
does not apply when using an external clock input.
The equivalent specification of the external clock
source should be used instead of t
trical Characteristics).
6.1.3 Clock Output Pin (MCO)
The internal clock (f
by setting the MCO bit in the Miscellaneous regis-
ter.
Figure 12. External Clock Source Connections
Figure 13. Crystal/Ceramic Resonator
C
OSCIN
Figure
OSCIN
EXTERNAL
CLOCK
OSCIN
12. The t
CPU
) can be output on Port B0
OSCOUT
OSCOUT
OXOV
NC
C
OSCOUT
OXOV
specifications
(see Elec-