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M38B53M4-059FP Datasheet(PDF) 270 Page - Mitsubishi Electric Semiconductor

Part # M38B53M4-059FP
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  355 Pages
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Manufacturer  MITSUBISHI [Mitsubishi Electric Semiconductor]
Direct Link  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M38B53M4-059FP Datasheet(HTML) 270 Page - Mitsubishi Electric Semiconductor

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3-22
APPENDIX
38B5 Group User’s Manual
3.3 Notes on use
Fig. 3.3.6 Initialization of processor status register
 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.
A NOP instruction should be executed after every PLP instruction.
3.3.10 Notes on programming
(1)
Processor status register
ΠInitializing 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.
q Reason
After a reset, the contents of the processor status register (PS) are undefined except for the I
flag which is “1”.
Fig. 3.3.8 Stack memory contents after PHP
instruction execution
Fig. 3.3.7 Sequence of PLP instruction execution
Reset
↓
Initializing of flags
↓
Main program
PLP instruction execution
↓
NOP
(S)
(S)+1
Stored PS



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