ST7FLIT19BY1B6 STMicroelectronics, ST7FLIT19BY1B6 Datasheet - Page 31

• Manufacturer Part Number: ST7FLIT19BY1B6
• Description: IC MCU 8BIT 4K FLASH 16DIP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST7FLIT19BY1B6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 7x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-DIP (0.300", 7.62mm)
• Processor Series: ST7FLIT1x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Development Tools By Supplier: ST7FLITE-SK/RAIS, ST7FLIT1B-D/RAIS, ST7MDT10-DVP3, ST7MDT10-EMU3, STX-RLINK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 7 Channel
• For Use With: 497-6232 - BOARD EVAL ST7LITE1B,STP5NK60Z497-5049 - KIT STARTER RAISONANCE ST7FLITE497-5046 - KIT TOOL FOR ST7/UPSD/STR7 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5629-5

7.6 SYSTEM INTEGRITY MANAGEMENT (SI)
The System Integrity Management block contains
the Low voltage Detector (LVD) and Auxiliary Volt-
age Detector (AVD) functions. It is managed by
the SICSR register.
Note: A reset can also be triggered following the
detection of an illegal opcode or prebyte code. Re-
fer to
tails.
7.6.1 Low Voltage Detector (LVD)
The Low Voltage Detector function (LVD) gener-
ates a static reset when the V
below a V
it secures the power-up as well as the power-down
keeping the ST7 in reset.
The V
lower than the V
on in order to avoid a parasitic reset when the
MCU starts running and sinks current on the sup-
ply (hysteresis).
The LVD Reset circuitry generates a reset when
V
The LVD function is illustrated in
The voltage threshold can be configured by option
byte to be low, medium or high.
Figure 18. Low Voltage Detector vs Reset
DD
– V
– V
V
V
RESET
is below:
IT-
IT+
IT+(LVD)
IT-(LVD)
IT-(LVD)
section 12.2.1 on page 107
(LVD)
(LVD)
IT-(LVD)
when V
when V
reference value for a voltage drop is
V
DD
IT+(LVD)
reference value. This means that
DD
DD
reference value for power-
is rising
is falling
DD
Figure
supply voltage is
for further de-
18.
Provided the minimum V
the oscillator frequency) is above V
MCU can only be in two modes:
In these conditions, secure operation is always en-
sured for the application without the need for ex-
ternal reset hardware.
During a Low Voltage Detector Reset, the RESET
pin is held low, thus permitting the MCU to reset
other devices.
Notes:
The LVD allows the device to be used without any
external RESET circuitry.
The LVD is an optional function which can be se-
lected by option byte.
Use of LVD with capacitive power supply: with this
type of power supply, if power cuts occur in the ap-
plication, it is recommended to pull V
0V to ensure optimum restart conditions. Refer to
circuit example in
note 4.
It is recommended to make sure that the V
ply voltage rises monotonously when the device is
exiting from Reset, to ensure the application func-
tions properly.
V
– under full software control
– in static safe reset
hys
Figure 106 on page 136
DD
value (guaranteed for
ST7LITE1xB
IT-(LVD)
DD
down to
DD
31/159
, the
sup-
and
1