ST92141 STMicroelectronics, ST92141 Datasheet - Page 88
ST92141
Manufacturer Part Number
ST92141
Description
8/16-bit Mcu For 3-phase Ac Motor Control
Manufacturer
STMicroelectronics
Datasheet
1.ST92141.pdf
(179 pages)
- Current page: 88 of 179
- Download datasheet (3Mb)
ST92141 - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont’d)
7.1.3.3 Preventing Watchdog System Reset
In order to prevent a system reset, the sequence
AAh, 55h must be written to WDTLR (Watchdog
Timer Low Register). Once 55h has been written,
the Timer reloads the constant and counting re-
starts from the preset value.
To reload the counter, the two writing operations
must be performed sequentially without inserting
other instructions that modify the value of the
WDTLR register between the writing operations.
The maximum allowed time between two reloads
of the counter depends on the Watchdog timeout
period.
Figure 50. Watchdog Timer Mode
88/179
COUNT
VALUE
9
WRITE WDTRH,WDTRL
COUNT RELOAD
PRODUCE
WRITE AAh,55h
INTO WDTRL
WD EN=0
G
TIMER START COUNTING
7.1.3.4 Non-Stop Operation
In Watchdog Mode, a Halt instruction is regarded
as illegal. Execution of the Halt instruction stops
further execution by the CPU and interrupt ac-
knowledgment, but does not stop INTCLK, CPU-
CLK or the Watchdog Timer, which will cause a
System Reset when the End of Count condition is
reached. Furthermore, ST_SP, S_C and the Input
Mode selection bits are ignored. Hence, regard-
less of their status, the counter always runs in
Continuous Mode, driven by the internal clock.
The Output mode should not be enabled, since in
this context it is meaningless.
(E.G. INFINITE LOOP)
OR PERIPHERAL FAIL
SOFTWARE FAIL
VA00220
RESET
Related parts for ST92141
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST62T15C / ST62T25C) 8-BIT OTP/EPROM MCUs WITH A/D CONVERTER
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST62E35B / ST62T35B) 8-BIT OTP/EPROM MCUs
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
8-BIT OTP/EPROM MCU WITH LCD DRIVER / EEPROM AND A/D CONVERTER
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
AUdio Amplifier
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
NPN MEDIUM POWER TRANSISTOR
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST90135 / ST90158) Microcontroller
Manufacturer:
ST Microelectronics
Part Number:
Description:
(ST90x27 / ST90x28) 16K EPROM HCMOS MCUS WITH RAM
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST90R28B6) 16K ROM / 256 RAM HCMOS MCUs
Manufacturer:
ST Microelectronics
Part Number:
Description:
(ST90x31) 8K EPROM HCMOS MCU
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(ST92195C/D) 48-96 Kbyte ROM HCMOS MCU
Manufacturer:
ST Microelectronics
Part Number:
Description:
16-48K ROM HCMOS MCU WITH ON SCREEN DISPLAY AND VOLTAGE TUNINGOUTPUT
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
48K ROM HCMOS MCUs WITH ON SCREEN DISPLAY AND A/D CONVERTER
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
24K ROM HCMOS MCU WITH ON SCREEN DISPLAY AND CLOSED-CAPTION DATA SLICER
Manufacturer:
ST Microelectronics
Datasheet: