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ST7265X Scheda tecnica(PDF) 29 Page - STMicroelectronics

Il numero della parte ST7265X
Spiegazioni elettronici  LOW-POWER, FULL-SPEED USB 8-BIT MCU WITH 32K FLASH, 5K RAM, FLASH CARD I/F, TIMER, PWM, ADC, I2C, SPI
PDF  166 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7265X Scheda tecnica(HTML) 29 Page - STMicroelectronics

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6.2 RESET SEQUENCE MANAGER (RSM)
6.2.1 Introduction
The reset sequence manager includes three RE-
SET sources as shown in Figure 6.2.2:
s
External RESET source pulse
s
Internal LVD RESET (Low Voltage Detection)
s
Internal WATCHDOG RESET
These sources act on the RESET pin and it is al-
ways kept low during the delay phase.
The RESET service routine vector is fixed at ad-
dresses FFFEh-FFFFh in the ST7 memory map.
The basic RESET sequence consists of 3 phases
as shown in Figure 18:
s
Active Phase depending on the RESET source
s
Min 512 CPU clock cycle delay (see Figure 20
and Figure 21
s
RESET vector fetch
Figure 18. RESET Sequences
VDD
RUN
RESET PIN
EXTERNAL
WATCHDOG
ACTIVE PHASE
VIT+(LVD)
VIT-(LVD)
th(RSTL)in
tw(RSTL)out
RUN
th(RSTL)in
ACTIVE
WATCHDOG UNDERFLOW
tw(RSTL)out
RUN
RUN
RUN
RESET
RESET
SOURCE
SHORT EXT.
RESET
LVD
RESET
LONG EXT.
RESET
WATCHDOG
RESET
INTERNAL RESET (min 512 TCPU)
VECTOR FETCH
tw(RSTL)out
PHASE
ACTIVE
PHASE
ACTIVE
PHASE
DELAY
1



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