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參數(shù)資料
| 型號： | M37549G1-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24 |
| 封裝： | 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 74/86頁 |
| 文件大?。?/td> | 1375K |
| 代理商： | M37549G1-XXXFP |
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Rev.2.02
Mar 31, 2009
Page 74 of 81
REJ03B0202-0202
7549 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. 86 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 87. 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 88. 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.
3. JMP Instruction
When using the JMP instruction (indirect addressing mode), do
not specify the address where “FF16” is allocated to the low-
order 8 bits as the operand.
4. Multiplication and Division Instructions
(1) The MUL and DIV instructions are not affected by the T
and D flags.
(2) Executing these instructions does not change the contents of
the processor status register.
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37549G1FP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24 |
| M37560M8-XXXFP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP100 |
| M37560EFDFP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP100 |
| M37560MFD-XXXFP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP100 |
| M37560EFFP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP100 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37549G2FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37549G2-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37549G3FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37549G3-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37549RLSS | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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