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參數(shù)資料
| 型號： | M38D24G4-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 36/138頁 |
| 文件大?。?/td> | 2880K |
| 代理商： | M38D24G4-XXXFP |
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Rev.3.02
Apr 10, 2008
Page 128 of 131
REJ03B0177-0302
38D2 Group
Notes on Flash Memory Mode
CPU Rewrite Mode
(1) Operating Speed
During CPU rewrite mode, set the system clock
φ to 4.0 MHz or
less using the main clock division ratio selection bits (bits 6 and
7 of address 003B16).
(2) Prohibited Instructions
During CPU rewrite mode, the instructions which reference data
in the flash memory cannot be used.
(3) Interrupts
During CPU rewrite mode, interrupts cannot be used because
they reference data in the flash memory.
(4) Watchdog Timer
If the watchdog timer has been running already, the internal reset
by underflow will not occur because the watchdog timer is
continuously cleared during program or erase operation.
(5) Reset
Reset is always valid. If CNVSS = “H” when a reset is released,
boot mode is active. The program starts from the address stored
in addresses FFFC16 and FFFD16 in boot ROM area.
Notes on Watchdog Timer
1. Watchdog Timer Underflow
The watchdog timer does not operate in stop mode, but it
continues counting during the wait time to release the stop state
and in wait mode. Write to the watchdog timer control register so
that the watchdog timer will not underflow during these periods.
2. Stopping On-Chip Oscillator Oscillation
When the on-chip oscillator is selected by the watchdog timer
count source selection bit 2, the on-chip oscillator forcibly
oscillates and it cannot be stopped. Also, in this time, set the STP
instruction function selection bit to “1” at this time.
Select “0” (
φSOURCE) for the watchdog timer count source
selection bit 2 at the system which on-chip oscillator is stopped.
3. Watchdog Timer Control Register
Bits 7 to 5 can be rewritten only once after a reset. After writing,
rewriting is disabled because they are locked. These bits are set
to “0” after a reset.
Notes on Differences between QzROM Version and
Flash Memory Version
The flash memory and QzROM versions differ in their
manufacturing processes, built-in ROM, memory size, and
layout patterns. Because of these differences, characteristic
values, operation margins, noise immunity, and noise radiation
and oscillation circuit constants may vary within the specified
range of electrical characteristics.
When switching to the QzROM version, implement system
evaluations equivalent to those performed in the flash memory
version.
Confirm page 11 about the differences of functions.
Notes on Power Source Voltage
When the power supply voltage value of the MCU is less than
the value indicated in the recommended operating conditions, the
MCU may not operate normally and perform unstable operation.
In a system where the power source voltage drops slowly when
the power source voltage drops or the power is turned off, reset
the MCU when the power source voltage is less than the
recommended operating conditions, and design the system so
that this unstable operation does not cause errors to it.
Notes on Handling Power Source Pins
Before using the MCU, connect a capacitor suitable for high
frequencies as a bypass capacitor between the following:
The power source pin (VCC pin) and the GND pin (VSS pin)
The power source pin (VCC pin) and the analog power source
input pin (AVSS pin). As a bypass capacitor, a ceramic capacitor
of 0.01
μF to 0.1 μF is recommended.
Also, use the shortest possible wiring to connect a bypass
capacitor between the power source pin and the GND pin and
between the power source pin and the analog power source pin.
Notes on Memory
1. RAM
The RAM content is undefined at a reset. Be sure to set the initial
value before use.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M38D24G4XXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38D24G5XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38D24G5XXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38D24G6FP#U0 | 功能描述:IC 740/38D2 MCU QZ-ROM 80QFP 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) |
| M38D24G6HP#U0 | 功能描述:IC 740/38D2 MCU QZ-ROM 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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