參數(shù)資料
型號(hào)： M37548G3FP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封裝： 4.40 X 6.50 MM, 0.65 MM PITCH, PLASTIC, LSSOP-20
文件頁數(shù)： 72/84頁
文件大?。?/td> 1427K
代理商： M37548G3FP
Rev.2.02
Mar 31, 2009
Page 74 of 81
REJ03B0210-0202
7548 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. 87 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 88. 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 89. 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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37548G3FP#U0 功能描述:MCU 6K ROM 256K 20-SSOP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 標(biāo)準(zhǔn)包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲(chǔ)器容量:96KB（96K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 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:48-LQFP 包裝:托盤 其它名稱:568-9587
M37548G3-XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37549G1FP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37549G1-XXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37549G2FP 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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