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ST72334J2TA/XXX 데이터시트(PDF) 28 Page - STMicroelectronics

부품명 ST72334J2TA/XXX
상세설명  8-bit MCU for automotive with single voltage Flash/ROM memory, ADC, 16-bit timers, SPI, SCI interfaces
PDF  150 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72334J2TA/XXX 데이터시트(HTML) 28 Page - STMicroelectronics

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8.2 RESET SEQUENCE MANAGER (RSM)
8.2.1 Introduction
The reset sequence manager includes three RE-
SET sources as shown in Figure 14:
■ External RESET source pulse
■ Internal LVD RESET (Low Voltage Detection)
■ 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 three
phases as shown in Figure 13:
■ Delay depending on the RESET source
■ 4096 CPU clock cycle delay
■ RESET vector fetch
The 4096 CPU clock cycle delay allows the oscil-
lator to stabilise and ensures that recovery has
taken place from the Reset state.
The RESET vector fetch phase duration is 2 clock
cycles.
Figure 13. RESET Sequence Phases
Figure 14. Reset Block Diagram
RESET
DELAY
INTERNAL RESET
4096 CLOCK CYCLES
FETCH
VECTOR
fCPU
RESET
RON
VDD
WATCHDOG RESET
LVD RESET
INTERNAL
RESET



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