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参数资料
| 型号： | M37548G2FP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | 4.40 X 6.50 MM, 0.65 MM PITCH, PLASTIC, LSSOP-20 |
| 文件页数： | 74/86页 |
| 文件大小： | 1437K |
| 代理商： | M37548G2FP |
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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
相关PDF资料 |
PDF描述 |
|---|---|
| M37548G1FP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20 |
| M37549G1-XXXFP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24 |
| M37549G3-XXXFP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24 |
| M37560M8-XXXFP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP100 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37548G2-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37548G3FP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37548G3FP#U0 | 功能描述:MCU 6K ROM 256K 20-SSOP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 标准包装:250 系列:LPC11Uxx 核心处理器:ARM? Cortex?-M0 芯体尺寸:32-位 速度:50MHz 连通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外围设备:欠压检测/复位，POR，WDT 输入/输出数:40 程序存储器容量:96KB（96K x 8） 程序存储器类型:闪存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):1.8 V ~ 3.6 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:48-LQFP 包装:托盘 其它名称:568-9587 |
| M37548G3-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37549G1FP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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