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M38262EBFS 데이터시트(PDF) 70 Page - Renesas Technology Corp

부품명 M38262EBFS
상세설명  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  91 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M38262EBFS 데이터시트(HTML) 70 Page - Renesas Technology Corp

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Rev.1.00
Sep 06, 2006
page 70 of 88
REJ03B0181-0100
3826 Group (One Time PROM version)
Fig. 3.3.1 Initialization of processor status register
➁ How to reference the processor status register
To reference the contents of the processor status register (PS), execute the PHP instruction
once then read the contents of (S+1). If necessary, execute the PLP instruction to return the
PS to its original status.
3.3 Notes on use
3.3.1 Notes on programming
(1)
Processor status register
➀ Initializing of processor status register
Flags which affect program execution must be initialized after a reset.
In particular, it is essential to initialize the T and D flags because they have an important effect
on calculations.
● Reason
After a reset, the contents of the processor status register (PS) are undefined except for the
I flag which is “1”.
Fig. 3.3.3 Stack memory contents after PHP
instruction execution
Reset
↓
Initializing of flags
↓
Main program
(S)
(S)+1
Stored PS



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