ST72C215G2M6 STMicroelectronics, ST72C215G2M6 Datasheet - Page 21

• Manufacturer Part Number: ST72C215G2M6
• Description: IC MCU 8BIT 8K FLASH SOIC-28
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72C215G2M6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 3.2 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Controller Family/series: ST7
• No. Of I/o's: 22
• Ram Memory Size: 256Byte
• Cpu Speed: 8MHz
• No. Of Timers: 2
• Rohs Compliant: Yes
• Processor Series: ST72C2x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 3 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST7MDT1-DVP2/US
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: In Transition

7.3 MULTI-OSCILLATOR (MO)
The main clock of the ST7 can be generated by
four different source types coming from the multi-
oscillator block:
Each oscillator is optimized for a given frequency
range in terms of consumption and is selectable
through the option byte. The associated hardware
configuration are shown in
electrical characteristics section for more details.
External Clock Source
In this external clock mode, a clock signal (square,
sinus or triangle) with ~50% duty cycle has to drive
the OSC1 pin while the OSC2 pin is tied to ground.
Crystal/Ceramic Oscillators
This family of oscillators has the advantage of pro-
ducing a very accurate rate on the main clock of
the ST7. The selection within a list of 4 oscillators
with different frequency ranges has to be done by
option byte in order to reduce consumption. In this
mode of the multi-oscillator, the resonator and the
load capacitors have to be placed as close as pos-
sible to the oscillator pins in order to minimize out-
put distortion and start-up stabilization time. The
loading capacitance values must be adjusted ac-
cording to the selected oscillator.
These oscillators are not stopped during the
RESET phase to avoid losing time in the oscillator
start-up phase.
External RC Oscillator
This oscillator allows a low cost solution for the
main clock of the ST7 using only an external resis-
tor and an external capacitor. The frequency of the
external RC oscillator (in the range of some MHz.)
is fixed by the resistor and the capacitor values.
Consequently in this MO mode, the accuracy of
the clock is directly linked to the accuracy of the
discrete components.
Internal RC Oscillator
The internal RC oscillator mode is based on the
same principle as the external RC oscillator includ-
ing the resistance and the capacitance of the de-
vice. This mode is the most cost effective one with
the drawback of a lower frequency accuracy. Its
frequency is in the range of several MHz.
In this mode, the two oscillator pins have to be tied
to ground.
an external source
4 crystal or ceramic resonator oscillators
an external RC oscillator
an internal high frequency RC oscillator
Table
3. Refer to the
ST72104G, ST72215G, ST72216G, ST72254G
Table 3. ST7 Clock Sources
R
C
L1
EX
Hardware Configuration
EXTERNAL
SOURCE
OSC1
OSC1
OSC1
OSC1
CAPACITORS
LOAD
ST7
ST7
ST7
ST7
OSC2
OSC2
OSC2
OSC2
C
C
EX
L2
21/140