ST62T20CB6 STMicroelectronics, ST62T20CB6 Datasheet - Page 21

IC MCU 8BIT OTP 4K 20 PDIP

ST62T20CB6

Manufacturer Part Number
ST62T20CB6
Description
IC MCU 8BIT OTP 4K 20 PDIP
Manufacturer
STMicroelectronics
Series
ST6r
Datasheet

Specifications of ST62T20CB6

Core Processor
ST6
Core Size
8-Bit
Speed
8MHz
Peripherals
LVD, POR, WDT
Number Of I /o
12
Program Memory Size
4KB (4K x 8)
Program Memory Type
OTP
Ram Size
64 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 6 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-DIP (0.300", 7.62mm)
Controller Family/series
ST6
No. Of I/o's
12
Ram Memory Size
64Byte
Cpu Speed
8MHz
No. Of Timers
1
Rohs Compliant
Yes
Processor Series
ST62T2x
Core
ST6
Data Bus Width
8 bit
Data Ram Size
64 B
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
12
Number Of Timers
2
Operating Supply Voltage
3 V to 6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Development Tools By Supplier
ST622XC-KIT/110, ST62GP-EMU2, ST62E2XC-EPB/110, ST62E6XC-EPB/US, STREALIZER-II
Minimum Operating Temperature
- 40 C
On-chip Adc
8 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Connectivity
-
Lead Free Status / Rohs Status
In Transition
Other names
497-2098-5
CLOCK SYSTEM (Cont’d)
5.1.2 Oscillator Safeguard (OSG)
The Oscillator Safeguard (OSG) feature is a
means of dramatically improving the operational
integrity of the MCU. It is available when the OSG
ENABLED option is selected in the option byte (re-
fer to the Option Bytes section of this document).
The OSG acts as a filter whose cross-over fre-
quency is device dependent and provides three
basic functions:
– Filtering spikes on the oscillator lines which
– Management of the Low Frequency Auxiliary
– Automatically limiting the f
5.1.2.1 Spike Filtering
Spikes on the oscillator lines result in an effectively
increased internal clock frequency. In the absence
of an OSG circuit, this may lead to an over fre-
quency for a given power supply voltage. The
OSG filters out such spikes (as illustrated in
10). In all cases, when the OSG is active, the max-
Figure 10. OSG Filtering Function
Figure 11. LFAO Oscillator Function
would result in driving the CPU at excessive fre-
quencies
Oscillator (LFAO), (useable as low cost internal
clock source, backup clock in case of main oscil-
lator failure or for low power consumption)
a function of supply voltage, to ensure correct
operation even if the power supply drops.
f
f
f
OSC
LFAO
INT
f
f
f
OSC
OSG
INT
MAIN OSCILLATOR
STOPS
INT
clock frequency as
f
OSC>
f
OSG
INTERNAL CLOCK DRIVEN BY LFAO
Figure
imum internal clock frequency, f
f
5.1.2.2
Variations
Over-frequency, at a given power supply level, is
seen by the OSG as spikes; it therefore filters out
some cycles in order that the internal clock fre-
quency of the device is kept within the range the
particular device can stand (depending on V
and below f
cy with OSG enabled.
5.1.2.3 LFAO Management
When the OSG is enabled, the Low Frequency
Auxiliary Oscillator can be used (see
5.1.3).
Note: The OSG should be used wherever possible
as it provides maximum security for the applica-
tion. It should be noted however, that it can in-
crease power consumption and reduce the maxi-
mum operating frequency to f
Characteristics section).
Caution: Care has to be taken when using the
OSG, as the internal frequency is defined between
a minimum and a maximum value and may vary
depending on both V
cise timing measurements, it is not recommended
to use the OSG.
OSG
, which is supply voltage dependent.
ST6208C/ST6209C/ST6210C/ST6220C
RESTARTS
MAIN OSCILLATOR
Management
OSG
: the maximum authorised frequen-
DD
f
OSC<
and temperature. For pre-
f
OSG
of
OSG
Supply
INT
(see Electrical
, is limited to
Voltage
Section
21/104
DD
),
1

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