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M68HC08 bảng dữ liệu(PDF) 94 Page - Freescale Semiconductor, Inc

tên linh kiện M68HC08
Giải thích chi tiết về linh kiện  Microcontrollers
PDF  288 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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M68HC08 bảng dữ liệu(HTML) 94 Page - Freescale Semiconductor, Inc

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System Integration Module (SIM)
Data Sheet
MC68HC908BD48 — Rev. 2.1
94
System Integration Module (SIM)
Freescale Semiconductor
Figure 7-5. Sources of Internal Reset
The active reset feature allows the part to issue a reset to peripherals
and other chips within a system built around the MCU.
7.4.2.1 Power-On Reset
When power is first applied to the MCU, the power-on reset module
(POR) generates a pulse to indicate that power-on has occurred. The
external reset pin (RST) is held low while the SIM counter counts out
4096 OSCXCLK cycles. Sixty-four OSCXCLK cycles later, the CPU and
memories are released from reset to allow the reset vector sequence to
occur.
At power-on, the following events occur:
•
A POR pulse is generated.
•
The internal reset signal is asserted.
•
The SIM enables the oscillator to drive OSCXCLK.
•
Internal clocks to the CPU and modules are held inactive for 4096
OSCXCLK cycles to allow stabilization of the oscillator.
•
The RST pin is driven low during the oscillator stabilization time.
•
The POR bit of the SIM reset status register (SRSR) is set and all
other bits in the register are cleared.
ILLEGAL ADDRESS RST
ILLEGAL OPCODE RST
COPRST
POR
INTERNAL
RESET



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