ST10F273Z4 STMicroelectronics, ST10F273Z4 Datasheet - Page 93
ST10F273Z4
Manufacturer Part Number
ST10F273Z4
Description
16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
Manufacturer
STMicroelectronics
Datasheet
1.ST10F273Z4.pdf
(188 pages)
Specifications of ST10F273Z4
Single Voltage Supply
5 V ±10%
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ST10F273Z4
20.6
Figure 24. SW / WDT unidirectional RESET (EA = 0)
Bidirectional reset
As shown in the previous sections, the RSTOUT pin is driven active (low level) at the
beginning of any reset sequence (synchronous/asynchronous hardware, software and
watchdog timer resets). RSTOUT pin stays active low beyond the end of the initialization
routine, until the protected EINIT instruction (End of Initialization) is completed.
The Bidirectional Reset function is useful when external devices require a reset signal but
cannot be connected to RSTOUT pin, because RSTOUT signal lasts during initialization. It
is, for instance, the case of external memory running initialization routine before the
execution of EINIT instruction.
Bidirectional reset function is enabled by setting bit 3 (BDRSTEN) in SYSCON register. It
only can be enabled during the initialization routine, before EINIT instruction is completed.
When enabled, the open drain of the RSTIN pin is activated, pulling down the reset signal,
for the duration of the internal reset sequence (synchronous/asynchronous hardware,
synchronous software and synchronous watchdog timer resets). At the end of the internal
reset sequence the pull down is released and:
●
●
RSTIN
RSTOUT
After a Short Synchronous Bidirectional Hardware Reset, if RSTF is sampled low 8
TCL periods after the internal reset sequence completion (refer to
Figure
sampled high the device simply exits reset state.
After a Software or Watchdog Bidirectional Reset, the device exits from reset. If RSTF
remains still low for at least 4 TCL periods (minimum time to recognize a Short
Hardware reset) after the reset exiting (refer to
P0[15:13]
P0[12:8]
P0[7:2]
P0[1:0]
ALE
RST
20), the Short Reset becomes a Long Reset. On the contrary, if RSTF is
not transparent
not transparent
not transparent
1024 TCL
transparent
Figure 25
and
Figure
Figure 19
not t.
not t.
26), the Software
8 TCL
System reset
and
93/188
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