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ST72311R Datasheet(HTML) 25 Page - STMicroelectronics

Part No. ST72311R
Description  8-BIT MCU WITH NESTED INTERRUPTS, EEPROM, ADC, 16-BIT TIMERS, 8-BIT PWM ART, SPI, SCI, CAN INTERFACES
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST72311R Datasheet(HTML) 25 Page - STMicroelectronics

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5.2 RESET SEQUENCE MANAGER (RSM)
5.2.1 Introduction
The reset sequence manager includes three RE-
SET sources as shown in Figure 12:
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 11:
s
Delay depending on the RESET source
s
4096 CPU clock cycle delay
s
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 11. RESET Sequence Phases
Figure 12. 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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