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7480 Datasheet(PDF) 259 Page - Renesas Technology Corp

Part # 7480
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  337 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7480 Datasheet(HTML) 259 Page - Renesas Technology Corp

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7480 Group and 7481 Group User's Manual
2-44
APPLICATIONS
2.9 Notes on Programming
2.9.1 Notes on Processor Status Register
Initialization of Processor Status Register
After system is released from reset, the
contents of processor status register (PS) are
undefined except for the I flag which is ‘1’.
Therefore, flags which affect program execution
must be initialized after system is released
from reset.
In particular, it is essential to initialize the T
and D flags because they have an important
effect on calculations.
How to Refer Processor Status Register
To refer 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.
The NOP instruction should be executed after
every PLP instruction.
Figure 2.9.1 Initialization of Flags in PS
Figure 2.9.2 Stack Memory Contents after PHP
Instruction Execution
Figure 2.9.3 PLP Instruction Execution
2.9 Notes on Programming
Pushed PS
Stack area
S+1
S
PLP instruction
NOP instruction
Reset
Main program
Flags of processor status register
(PS) initializing



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