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HD6433636SW Folha de dados(PDF) 72 Page - Renesas Technology Corp

Nome de Peças HD6433636SW
Descrição Electrónicos  8-Bit Microcomputer
PDF  418 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
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HD6433636SW Folha de dados(HTML) 72 Page - Renesas Technology Corp

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58
• The PC is loaded from the reset exception handling vector address (H'0000 to H'0001), after
which the program starts executing from the address indicated in PC.
When system power is turned on or off, the
RES pin should be held low.
Figure 3.1 shows the reset sequence.
Vector fetch
ø
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)
Reset cleared
(1)
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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