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參數(shù)資料
| 型號： | M38039FFLKP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 16.8 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 112/119頁 |
| 文件大?。?/td> | 2127K |
| 代理商： | M38039FFLKP |
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Rev.1.01
Jan 25, 2008
Page 92 of 117
REJ03B0212-0101
3803 Group (Spec.L)
NOTES
NOTES ON PROGRAMMING
1. Processor Status Register
(1) Initializing 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.
<Reason>
After a reset, the contents of the processor status register (PS) are
undefined except for the I flag which is “1”.
Fig 87. Initialization of processor status register
(2) 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.
Fig 88. Stack memory contents after PHP instruction
execution
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, execute 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
determine 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 calculation.
Fig 89. Execution of decimal calculations
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. Multiplication and Division Instructions
The index X mode (T) and the decimal mode (D) flags do not
affect the MUL and DIV instruction.
The execution of these instructions does not change the
contents of the processor status register.
5. Ports
The contents of the port direction registers cannot be read. The
following cannot be used:
The data transfer instruction (LDA, etc.)
The operation instruction when the index X mode flag (T) is “1”
The instruction with the addressing mode which uses the value
of a direction register as an index
The bit-test instruction (BBC or BBS, etc.) to a direction
register
The read-modify-write instructions (ROR, CLB, or SEB, etc.)
to a direction register.
Use instructions such as LDM and STA, etc., to set the port
direction registers.
6. Instruction Execution Timing
The instruction execution time can be obtained by multiplying
the frequency of the internal clock
φ by the number of cycles
mentioned in the 740 Family Software Manual.
The frequency of the internal clock
φ is the twice the XIN cycle in
high-speed mode, 8 times the XIN cycle in middle-speed mode,
and the twice the XCIN in low-speed mode.
Reset
Initializing of flags
Main program
Stored PS
(S)
(S) + 1
Set D flag to “1”
ADC or SBC instruction
NOP instruction
SEC, CLC, or CLD instruction
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| M38039G4HHP#U0 | 功能描述:IC 740/3803 MCU QZROM 64LQFP 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(shè)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(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
| M38039G4HKP#U0 | 功能描述:IC 3803 MCU ROMLESS 64LQFP 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(shè)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(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)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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