ST72T331N2T6 STMicroelectronics, ST72T331N2T6 Datasheet - Page 37
![no-image](/images/manufacturer_photos/0/6/637/stmicroelectronics_sml.jpg)
ST72T331N2T6
Manufacturer Part Number
ST72T331N2T6
Description
8-bit Microcontrollers - MCU OTP EPROM 8K SPI/SCI
Manufacturer
STMicroelectronics
Datasheet
1.ST72T331N2T6.pdf
(107 pages)
Specifications of ST72T331N2T6
Product Category
8-bit Microcontrollers - MCU
Rohs
yes
Core
ST7
Data Bus Width
8 bit
Maximum Clock Frequency
16 MHz
Program Memory Size
8 KB
Data Ram Size
384 B
On-chip Adc
Yes
Package / Case
TQFP-64
Mounting Style
SMD/SMT
A/d Bit Size
8 bit
A/d Channels Available
8
Interface Type
SCI, SPI
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
44
Number Of Timers
2
On-chip Dac
No
Program Memory Type
EPROM
Factory Pack Quantity
90
Supply Voltage - Max
5.5 V
Supply Voltage - Min
3.5 V
- Current page: 37 of 107
- Download datasheet (2Mb)
5.3 WATCHDOG TIMER (WDG)
5.3.1 Introduction
The Watchdog timer is used to detect the occur-
rence of a software fault, usually generated by ex-
ternal interference or by unforeseen logical condi-
tions, which causes the application program to
abandon its normal sequence. The Watchdog cir-
cuit generates an MCU reset on expiry of a pro-
grammed time period, unless the program refresh-
es the counter’s contents before the T6 bit be-
comes cleared.
5.3.2 Main Features
Figure 25. Watchdog Block Diagram
Programmable timer (64 increments of 12288
CPU cycles)
Programmable reset
Reset (if watchdog activated) after a HALT
instruction or when the T6 bit reaches zero
f
CPU
WDGA
RESET
T6
T5
WATCHDOG CONTROL REGISTER (CR)
7-BIT DOWNCOUNTER
CLOCK DIVIDER
T4
12288
T3
5.3.3 Functional Description
The counter value stored in the CR register (bits
T[6:0]), is decremented every 12,288 machine cy-
cles, and the length of the timeout period can be
programmed by the user in 64 increments.
If the watchdog is activated (the WDGA bit is set)
and when the 7-bit timer (bits T[6:0]) rolls over
from 40h to 3Fh (T6 becomes cleared), it initiates
a reset cycle pulling low the reset pin for typically
500ns.
T2
Hardware Watchdog selectable by option byte
Watchdog Reset indicated by status flag (in
versions with Safe Reset option only)
T1
T0
ST72E331 ST72T331
37/107
37
Related parts for ST72T331N2T6
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ST72T331](/images/no-image3.png)
Part Number:
Description:
8-BIT MCU WITH 8 TO 16K OTP/EPROM, 256 EEPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS
Manufacturer:
STMICROELECTRONICS [STMicroelectronics]
Datasheet:
![HCF4040BF](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
STMicroelectronics [RIPPLE-CARRY BINARY COUNTER/DIVIDERS]
Manufacturer:
STMicroelectronics
Datasheet:
![HCF4054BF](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
STMicroelectronics [LIQUID-CRYSTAL DISPLAY DRIVERS]
Manufacturer:
STMicroelectronics
Datasheet:
![STEVAL-MKI062V2](/photos/28/39/283999/steval-mki062v2_tmb.jpg)
Part Number:
Description:
BOARD EVAL FOR MEMS SENSORS
Manufacturer:
STMicroelectronics
Datasheet:
![BUT32V](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
NPN TRANSISTOR POWER MODULE
Manufacturer:
STMicroelectronics
Datasheet:
![STTA12006TV2](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
TURBOSWITCH ULTRA-FAST HIGH VOLTAGE DIODE
Manufacturer:
STMicroelectronics
Datasheet:
![E110NS20FD](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
Manufacturer:
STMicroelectronics
Datasheet:
![MDS50-800](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
DIODE / SCR MODULE
Manufacturer:
STMicroelectronics
Datasheet:
![MDS35-800](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
DIODE / SCR MODULE
Manufacturer:
STMicroelectronics
Datasheet:
![E16N100](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
Search -----> STE16N100
Manufacturer:
STMicroelectronics
Datasheet:
![E53NA50](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
Search ---> STE53NA50
Manufacturer:
STMicroelectronics
Datasheet:
![BUV98AF](/images/manufacturer_photos/0/6/637/stmicroelectronics_tmb.jpg)
Part Number:
Description:
NPN Transistor Power Module
Manufacturer:
STMicroelectronics
Datasheet: