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參數(shù)資料
| 型號： | M37544M2-XXXSP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | 0.400 INCH, 1.78 MM PITCH, PLASTIC, SDIP-32 |
| 文件頁數(shù)： | 55/68頁 |
| 文件大?。?/td> | 738K |
| 代理商： | M37544M2-XXXSP |
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7544 Group
Rev.1.04
2004.06.08
page 59 of 66
REJ03B0012-0104Z
APPENDIX
NOTES ON PROGRAMMING
1. Processor Status Register
(1) Initializing of processor status register
Flags which affect program execution must be initialized after a re-
set.
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”.
Reset
↓
Initializing of flags
↓
Main program
Fig. 3 Stack memory contents after PHP instruction execution
PLP instruction execution
↓
NOP
Fig. 1 Initialization of processor status register
(2) How to reference the processor status register
To reference the contents of the processor status register (PS), ex-
ecute the PHP instruction once then read the contents of (S+1). If
necessary, execute the PLP instruction to return the PS to its origi-
nal status.
A NOP instruction should be executed after every PLP instruction.
Fig. 2 Sequence of PLP instruction execution
(S)
(S)+1
Stored PS
3. JMP instruction
When using the JMP instruction in indirect addressing mode, do
not specify the last address on a page as an indirect address.
4. BRK instruction
(1) Interrupt priority level
When the BRK instruction is executed with the following condi-
tions satisfied, the interrupt execution is started from the address
of interrupt vector which has the highest priority.
Interrupt request bit and interrupt enable bit are set to “1”.
Interrupt disable flag (I) is set to “1” to disable interrupt.
5. Multiplication and Division Instructions
(1) The index X mode (T) and the decimal mode (D) flags do not
affect the MUL and DIV instruction.
(2) The execution of these instructions does not change the con-
tents of the processor status register.
Set D flag to “1”
↓
ADC or SBC instruction
↓
NOP instruction
↓
SEC, CLC, or CLD instruction
Fig. 4 Status flag at decimal calculations
2. Decimal calculations
(1) Execution of decimal calculations
The ADC and SBC are the only instructions which will yield proper
decimal notation, set the decimal mode flag (D) to “1” with the
SED instruction. After executing the ADC or SBC instruction, ex-
ecute another instruction before executing the SEC, CLC, or CLD
instruction.
(2) Notes on status flag in decimal mode
When decimal mode is selected, the values of three of the flags in
the status register (the N, V, and Z flags) are invalid after a ADC or
SBC instruction is executed.
The carry flag (C) is set to “1” if a carry is generated as a result of
the calculation, or is cleared to “0” if a borrow is generated. To de-
termine whether a calculation has generated a carry, the C flag
must be initialized to “0” before each calculation. To check for a
borrow, the C flag must be initialized to “1” before each calcula-
tion.
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| M37545G4GP#U0 | 功能描述:MCU 2/5V 16K 32-LQFP QZ-ROM RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 標準包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設備:POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
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