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參數(shù)資料
| 型號： | M37546G2-XXXGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件頁數(shù)： | 79/105頁 |
| 文件大?。?/td> | 1105K |
| 代理商： | M37546G2-XXXGP |
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REJ03B0160-0122 Rev.1.22 Mar 13, 2009
page 73 of 100
7546 Group
NOTES ON PROGRAMMING
Processor Status Register
The contents of the processor status register (PS) after reset are un-
defined except for the interrupt disable flag I which is “1”. After reset,
initialize flags which affect program execution. In particular, it is es-
sential to initialize the T flag and the D flag because of their effect on
calculations. Initialize these flags at beginning of the program.
Interrupts
The contents of the interrupt request bit do not change even if the
BBC or BBS instruction is executed immediately after they are
changed by program because this instruction is executed for the
previous contents. For executing the instruction for the changed
contents, execute one instruction before executing the BBC or
BBS instruction.
Decimal Calculations
For calculations in decimal notation, set the decimal mode flag
D to “1”, then execute the ADC instruction or SBC instruction. In
this case, execute SEC instruction, CLC instruction or CLD in-
struction after executing one instruction before the ADC instruction
or SBC instruction.
In the decimal mode, the values of the N (negative), V (overflow)
and Z (zero) flags are invalid.
Ports
The values of the port direction registers cannot be read.
That is, it is impossible to use the LDA instruction, memory opera-
tion instruction when the T flag is “1”, addressing mode using
direction register values as qualifiers, and bit test instructions such
as BBC and BBS.
It is also impossible to use bit operation instructions such as CLB
and SEB and read/modify/write instructions of direction registers
for calculations such as ROR.
For setting direction registers, use the LDM instruction, STA in-
struction, etc.
A/D Conversion
Do not execute the STP instruction during A/D conversion.
Instruction Execution Timing
The instruction execution time can be obtained by multiplying the
frequency of the internal clock φ by the number of cycles men-
tioned in the machine-language instruction table.
The frequency of the internal clock φ is the same as that of the XIN
in double-speed mode, twice the XIN cycle in high-speed mode
and 8 times the XIN cycle in middle-speed mode.
CPU Mode Register
The oscillation mode selection bit and processor mode bits can be
rewritten only once after releasing reset. However, after rewriting it
is disable to write any value to the bit. (Emulator MCU is ex-
cluded.)
When a ceramic oscillation is selected, a double-speed mode of
the clock division ratio selection bits can be used. Do not use it
when an RC oscillation is selected.
State transition
Do not stop the clock selected as the operation clock because of
setting of CM3, 4.
NOTES ON HARDWARE
Handling of Power Source Pin
In order to avoid a latch-up occurrence, connect a capacitor suit-
able for high frequencies as bypass capacitor between power
source pin (Vcc pin) and GND pin (Vss pin). Besides, connect the
capacitor to as close as possible. For bypass capacitor which
should not be located too far from the pins to be connected, a ce-
ramic capacitor of 0.01 F to 0.1 F is recommended.
相關PDF資料 |
PDF描述 |
|---|---|
| M37546G4-XXXGP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37546G4-XXXHP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36 |
| M37546G2GP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37546G2HP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36 |
| M37546G4-XXXSP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M37546G2-XXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37546G2-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37546G4GP | 功能描述:MCU 2/5V 16K 32-LQFP 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(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) |
| M37546G4GP#U0 | 功能描述:MCU 2/5V 16K 32-LQFP 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(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) |
| M37546G4HP | 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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