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ST7LITE49K2 データシート(PDF) 43 Page - STMicroelectronics

部品番号 ST7LITE49K2
部品情報  Communication interfaces
PDF  245 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LITE49K2 データシート(HTML) 43 Page - STMicroelectronics

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ST7LITE49K2
Supply, reset and clock management
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7.3
Reset sequence manager (RSM)
7.3.1
Introduction
The reset sequence manager includes three RESET sources as shown in Figure 15:
External RESET source pulse
Internal LVD RESET (Low Voltage Detection)
Internal WATCHDOG RESET
Note:
A reset can also be triggered following the detection of an illegal opcode or prebyte code.
Refer to Section 12.2.1 on page 189 for further details.
These sources act on the RESET pin and it is always kept low during the delay phase.
The RESET service routine vector is fixed at addresses FFFEh-FFFFh in the ST7 memory
mapping.
The basic RESET sequence consists of 3 phases as shown in Figure 14:
Active Phase depending on the RESET source
256 CPU clock cycle delay (see Table 7)
Table 6.
ST7 clock sources
Hardware configuration
OSC1
OSC2
EXTERNAL
ST7
SOURCE
OSC1
OSC2
LOAD
CAPACITORS
ST7
CL2
CL1
OSC1
OSC2
ST7



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