ST62T65CN6 STMicroelectronics, ST62T65CN6 Datasheet - Page 24

Microcontrollers (MCU) OTP EPROM 4K SPI

ST62T65CN6

Manufacturer Part Number
ST62T65CN6
Description
Microcontrollers (MCU) OTP EPROM 4K SPI
Manufacturer
STMicroelectronics
Datasheet

Specifications of ST62T65CN6

Processor Series
ST62T6x
Core
ST6
Data Bus Width
8 bit
Program Memory Type
EPROM
Program Memory Size
3884 B
Data Ram Size
128 B
Interface Type
SCI
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
21
Number Of Timers
1
Operating Supply Voltage
3 V to 6 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
SSOP-28
Minimum Operating Temperature
- 40 C
On-chip Adc
8 bit
Lead Free Status / Rohs Status
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ST62T55C ST62T65C/E65C
RESETS (Cont’d)
3.2.3 Watchdog Reset
The MCU provides a Watchdog timer function in
order to ensure graceful recovery from software
upsets. If the Watchdog register is not refreshed
before an end-of-count condition is reached, the
internal reset will be activated. This, amongst oth-
er things, resets the watchdog counter.
The MCU restarts just as though the Reset had
been generated by the RESET pin, including the
built-in stabilisation delay period.
3.2.4 LVD Reset
The on-chip Low Voltage Detector, selectable as
user option, features static Reset when supply
voltage is below a reference value. Thanks to this
feature, external reset circuit can be removed
while keeping the application safety. This SAFE
RESET is effective as well in Power-on phase as
in power supply drop with different reference val-
Figure 14. LVD Reset on Power-on and Power-down (Brown-out)
3.2.5 Application Notes
No external resistor is required between V
the Reset pin, thanks to the built-in pull-up device.
24/86
V
V
V
DD
dn
Up
RESET
DD
and
ues, allowing hysteresis effect. Reference value in
case of voltage drop has been set lower than the
reference value for power-on in order to avoid any
parasitic Reset when MCU start's running and
sinking current on the supply.
As long as the supply voltage is below the refer-
ence value, there is a internal and static RESET
command. The MCU can start only when the sup-
ply voltage rises over the reference value. There-
fore, only two operating mode exist for the MCU:
RESET active below the voltage reference, and
running mode over the voltage reference as
shown on the
up, power-down sequence.
Note: When the RESET state is controlled by one
of the internal RESET sources (Low Voltage De-
tector, Watchdog, Power on Reset), the RESET
pin is tied to low logic level.
Direct external connection of the pin RESET to
V
haviour of the internal reset sources (AND.Wired
structure).
DD
must be avoided in order to ensure safe be-
Figure
14, that represents a power-
RESET
time
VR02106A

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