ST72T213G1B6 STMicroelectronics, ST72T213G1B6 Datasheet - Page 16

• Manufacturer Part Number: ST72T213G1B6
• Description: 8-bit Microcontrollers - MCU OTP EPROM 4K SPI
• Manufacturer: STMicroelectronics

Specifications of ST72T213G1B6

• Rohs: yes
• Core: ST7
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 4 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 5.5 V
• Package / Case: PDIP-32
• Mounting Style: Through Hole
• A/d Bit Size: 8 bit
• A/d Channels Available: 6
• Interface Type: SPI
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 22
• Number Of Timers: 1
• On-chip Dac: No
• Program Memory Type: OTP EPROM
• Factory Pack Quantity: 16
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 3.5 V

ST72101/ST72212/ST72213
3 CLOCKS, RESET, INTERRUPTS & POWER SAVING MODES
3.1 CLOCK SYSTEM
3.1.1 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
The external Oscillator clock is first divided by 2,
and division factor of 32 can be applied if Slow
Mode is selected by setting the SMS bit in the Mis-
cellaneous Register. This reduces the frequency
of the f
on-chip peripherals.
The internal oscillator is designed to operate with
an AT-cut parallel resonant quartz crystal resona-
tor in the frequency range specified for f
circuit shown in
using a crystal, and
ed capacitance and feedback resistance values.
The crystal and associated components should be
mounted as close as possible to the input pins in
order to minimize output distortion and start-up
stabilisation time.
Use of an external CMOS oscillator is recom-
mended when crystals outside the specified fre-
quency ranges are to be used.
Table 6. Recommended Values for 16 MHz
C
tal.
R
er limit, see crystal specification).
C
OSCIN and OSCOUT, including the external ca-
pacitance plus the parasitic capacitance of the
board and the device.
16/85
16
0
SMAX
OSCOUT
C
: parasitic shunt capacitance of the quartz crys-
C
R
OSCOUT
OSCIN
SMAX
: equivalent serial resistor of the crystal (up-
CPU
, C
Crystal Resonator (C
; the clock signal is also routed to the
OSCIN
56pF
56pF
Figure 13
40
: maximum total capacitance on
Table 6
is recommended when
lists the recommend-
47pF
47pF
60
0
<7pF)
CPU
150
22pF
22pF
osc
) is de-
. The
OSC
)
.
Figure 12. External Clock Source Connections
Figure 13. Crystal/Ceramic Resonator
Figure 14. Clock Prescaler Block Diagram
C
OSCIN
OSCIN
C
OSCIN
OSCOUT
EXTERNAL
OSCIN
CLOCK
OSCIN
C
OSCOUT
%2
OSCOUT
OSCOUT
NC
% 16
C
OSCOUT
f
to CPU and
Peripherals
CPU