參數(shù)資料
型號: ST72321BM
廠商: 意法半導(dǎo)體
英文描述: 80-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU)
中文描述: 80引腳8位微控制器32至60,000閃存/ ROM,ADC的,5個(gè)定時(shí)器,SPI和SCI的I2C接口(具有比較方案,國際檢察官聯(lián)合會,嵌套中斷,中華語文研習(xí)所,人事登記的8位微控制器)
文件頁數(shù): 26/178頁
文件大?。?/td> 3121K
代理商: ST72321BM
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ST72F321M, ST72321BM
26/178
RESET SEQUENCE MANAGER
(Cont’d)
The RESET pin is an asynchronous signal which
plays a major role in EMS performance. In a noisy
environment, it is recommended to follow the
guidelines mentioned in the electrical characteris-
tics section.
If the external RESET pulse is shorter than
t
w(RSTL)out
(see short ext. Reset in
Figure 13
), the
signal on the RESET pin may be stretched. Other-
wise the delay will not be applied (see long ext.
Reset in
Figure 13
). Starting from the external RE-
SET pulse recognition, the device RESET pin acts
as an output that is pulled low during at least
t
w(RSTL)out
.
6.3.3 External Power-On RESET
If the LVD is disabled by option byte, to start up the
microcontroller correctly, the user must ensure by
means of an external reset circuit that the reset
signal is held low until V
DD
is over the minimum
level specified for the selected f
OSC
frequency.
(see
“OPERATING CONDITIONS” on page 136
)
A proper reset signal for a slow rising V
DD
supply
can generally be provided by an external RC net-
work connected to the RESET pin.
6.3.4 Internal Low Voltage Detector (LVD)
RESET
Two different RESET sequences caused by the in-
ternal LVD circuitry can be distinguished:
Power-On RESET
Voltage Drop RESET
The device RESET pin acts as an output that is
pulled low when V
DD
<V
IT+
(rising edge) or
V
DD
<V
IT-
(falling edge) as shown in
Figure 13
.
The LVD filters spikes on V
DD
larger than t
g(VDD)
to
avoid parasitic resets.
6.3.5 Internal Watchdog RESET
The RESET sequence generated by a internal
Watchdog counter overflow is shown in
Figure 13
.
Starting from the Watchdog counter underflow, the
device RESET pin acts as an output that is pulled
low during at least t
w(RSTL)out
.
Figure 13. RESET Sequences
V
DD
RUN
RESET PIN
EXTERNAL
RESET
SOURCE
WATCHDOG
RESET
ACTIVE PHASE
V
IT+(LVD)
V
IT-(LVD)
t
h(RSTL)in
t
w(RSTL)out
RUN
t
h(RSTL)in
ACTIVE
PHASE
WATCHDOG UNDERFLOW
t
w(RSTL)out
RUN
RUN
RUN
SHORT EXT.
RESET
LVD
RESET
LONG EXT.
RESET
WATCHDOG
RESET
INTERNAL RESET (256 or 4096 T
CPU
)
VECTOR FETCH
t
w(RSTL)out
ACTIVE
PHASE
ACTIVE
PHASE
DELAY
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