ST10F276Z5 STMicroelectronics, ST10F276Z5 Datasheet - Page 106
ST10F276Z5
Manufacturer Part Number
ST10F276Z5
Description
16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
Manufacturer
STMicroelectronics
Datasheet
1.ST10F276Z5.pdf
(239 pages)
Specifications of ST10F276Z5
Single Voltage Supply
5V ±10% (embedded regulator for 1.8 V core supply)
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System reset
19
19.1
106/239
System reset
System reset initializes the MCU in a predefined state. There are six ways to activate a reset
state. The system start-up configuration is different for each case as shown in
Table 61.
1. See next
2. RSTIN pulse should be longer than 500 ns (Filter) and than settling time for configuration of Port0.
3. The RPD status has no influence unless Bidirectional Reset is activated (bit BDRSTEN in SYSCON): RPD
Input filter
On RSTIN input pin an on-chip RC filter is implemented. It is sized to filter all the spikes
shorter than 50 ns. On the other side, a valid pulse shall be longer than 500 ns to grant that
ST10 recognizes a reset command. In between 50 ns and 500 ns a pulse can either be
filtered or recognized as valid, depending on the operating conditions and process
variations.
For this reason all minimum durations mentioned in this Chapter for the different kind of
reset events shall be carefully evaluated taking into account of the above requirements.
In particular, for Short Hardware Reset, where only 4 TCL is specified as minimum input
reset pulse duration, the operating frequency is a key factor. Examples:
●
●
Power-on reset
Asynchronous Hardware reset
Synchronous Long Hardware
reset
Synchronous Short Hardware
reset
Watchdog Timer reset
Software reset
low inhibits the Bidirectional reset on SW and WDT reset events, that is RSTIN is not activated (refer to
Section
For a CPU clock of 64 MHz, 4 TCL is 31.25 ns, so it would be filtered. In this case the
minimum becomes the one imposed by the filter (that is 500 ns).
For a CPU clock of 4 MHz, 4 TCL is 500 ns. In this case the minimum from the formula
is coherent with the limit imposed by the filter.
Reset Source
19.4,
Section 19.1
Reset event definition
Section 19.5
for more details on minimum reset pulse duration.
and
Section
SHWR
WDTR
PONR
LHWR
SWR
Flag
19.6).
(1)
Status
RPD
High
High
Low
Low
(3)
Power-on
(2)
t
500 ns)
t
t
500 ns)
WDT overflow
SRST instruction execution
RSTIN
RSTIN
RSTIN
> max(4 TCL, 500 ns)
> (1032 + 12) TCL + max(4 TCL,
≤ (1032 + 12) TCL + max(4 TCL,
Conditions
Table
ST10F276Z5
61.
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