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| 型號(hào)： | 38D5 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 121/141頁(yè) |
| 文件大小： | 2027K |
| 代理商： | 38D5 |
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Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 121 of 134
38D5 Group
APPENDIX
Note on Programming
1. Processor Status Register
(1) Initialization of the processor status register
It is required to initialize the processor status register (PS) flags
which affect program execution. It is particularly essential to
initialize the T and D flags because of their effect on
calculations. Initialize these flags at the beginning of the
program.
<Reason>
At a reset, the contents of the processor status register (PS) are
undefined except for the I flag which is “1”.
Fig. 99 Initialization of processor status register flags
(2) How to refer the processor status register
To refer the contents of the processor status register (PS), execute
the PHP instruction once and then read the contents of (S+1). If
necessary, execute the PLP instruction to return the stored PS to
its original status.
Fig. 100 Stack memory contents after PHP instruction
execution
2. Decimal Calculations
(1) Instructions for decimal calculations
To perform decimal calculations, set the decimal mode (D) flag
to “1” with the SED instruction and execute the ADC or SBC
instruction. In that case, after the ADC or SBC instruction,
execute another instruction before the SEC, CLC, or CLD
instruction.
Fig. 101 Instructions for decimal calculations
(2) Status flag at decimal calculations
When the ADC or SBC instruction is executed in decimal mode
(D flag = “1”), three of the status flags (N, V, and Z) are disabled.
The carry (C) flag is set to “1” if a carry is generated and is
cleared to “0” if a borrow is generated as a result of a calculation,
so it can be used to determine whether the calculation has
generated a carry or borrow.
Initialize the C flag before each calculation.
Reset
Initialize the flags
Main program
Stored PS
(S)
(S) + 1
Set the decimal mode (D) flag to “1”
Execute the ADC or SBC instruction
NOP
Execute the SEC, CLC, or CLD instruction
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