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H838532H bảng dữ liệu(PDF) 80 Page - Renesas Technology Corp

tên linh kiện H838532H
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series
PDF  508 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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H838532H bảng dữ liệu(HTML) 80 Page - Renesas Technology Corp

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Section 3 Exception Handling
Rev. 1.00 May 30, 2008 Page 60 of 484
REJ09B0436-0100
When system power is turned on or off, the
RES pin should be held low.
Figure 3.1 shows the reset sequence starting from
RES input.
Vector fetch
φ
Internal
address bus
Internal read
signal
Internal write
signal
Internal data
bus (16-bit)
RES
Internal
processing
Program initial
instruction prefetch
(1) Reset exception handling vector address (H'0000)
(2) Program start address
(3) First instruction of program
(2)
(3)
(2)
(1)
Reset cleared
Figure 3.1 Reset Sequence
3.2.3
Interrupt Immediately after Reset
After a reset, if an interrupt were to be accepted before the stack pointer (SP: R7) was initialized,
PC and CCR would not be pushed onto the stack correctly, resulting in program runaway. To
prevent this, immediately after reset exception handling all interrupts are masked. For this reason,
the initial program instruction is always executed immediately after a reset. This instruction should
initialize the stack pointer (e.g. MOV.W #xx: 16, SP).



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