- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45035 > M37544G2ASP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 PDF資料下載
參數(shù)資料
| 型號： | M37544G2ASP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | 28 X 8.90 MM, 1.78 MM PITCH, PLASTIC, SDIP-32 |
| 文件頁數(shù)： | 69/75頁 |
| 文件大小： | 649K |
| 代理商： | M37544G2ASP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁當(dāng)前第69頁第70頁第71頁第72頁第73頁第74頁第75頁
7544 Group (QzROM version)
REJ03B0108-0103
Rev.1.03
Mar 31, 2009
page 71 of 72
Notes on Clock Generating Circuit
1. Switch of ceramic/quartz-crystal oscillation and RC oscillation
After releasing reset, the oscillation mode selection bit (bit 5 of
CPU mode register (address 003B16)) is “0” (ceramic/quartz-crys-
tal oscillation selected). When the RC oscillation is used, after
releasing reset, set this bit to “1”.
2. Double-speed mode
The double-speed mode can be used only when a ceramic oscilla-
tion is selected. Do not use it when an RC oscillation is selected.
3. CPU mode register
Oscillation mode selection bit (bit 5), processor mode bits (bits 1
and 0) of CPU mode register (address 003B16) are used to select
oscillation mode and to control operation modes of the microcom-
puter. In order to prevent the dead-lock by erroneously writing (ex.
program run-away), these bits can be rewritten only once after re-
leasing reset. After rewriting, it is disabled to write any data to the
bit. (The emulator MCU “M37542RSS” is excluded.)
Also, when the read-modify-write instructions (SEB, CLB, etc.) are
executed to bits 2 to 4, 6 and 7, bits 5, 1 and 0 are locked.
4. Clock division ratio, XIN oscillation control, on-chip oscillator
control
The state transition shown in Fig. 49 can be performed by setting
the clock division ratio selection bits (bits 7 and 6), XIN oscillation
control bit (bit 4), on-chip oscillator oscillation control bit (bit 3) of
CPU mode register. Be careful of notes on use in Fig. 49.
5. On-chip oscillator operation
When the MCU operates by the on-chip oscillator for the main
clock, connect XIN pin to VCC through a 1 k to 10 k resistor and
leave XOUT pin open.
The clock frequency of the on-chip oscillator depends on the sup-
ply voltage and the operation temperature range.
Be careful that this margin of frequencies when designing applica-
tion products.
6. Ceramic resonator
When the ceramic resonator/quartz-crystal oscillation is used for
the main clock, connect the ceramic resonator and the external
circuit to pins XIN and XOUT at the shortest distance. A feedback
resistor is built-in.
7. RC oscillation
When the RC oscillation is used for the main clock, connect the
XIN pin and XOUT pin to the external circuit of resistor R and the
capacitor C at the shortest distance.
The frequency is affected by a capacitor, a resistor and a micro-
computer.
So, set the constants within the range of the frequency limits.
8. External clock
When the external signal clock is used for the main clock, connect
the XIN pin to the clock source and leave XOUT pin open.
Select “0” (ceramic oscillation) to oscillation mode selection bit.
9. Count source (Timer 1, Timer A, Timer X, Serial I/O, A/D con-
verter, Watchdog timer)
The count sources of these functions are affected by the clock di-
vision selection bit of the CPU mode register.
The f(XIN) clock is supplied to the watchdog timer when selecting
f(XIN) as the CPU clock.
The on-chip oscillator output is supplied to these functions when
selecting the on-chip oscillator output as the CPU clock.
Notes on Oscillation Control
1. Oscillation stop detection circuit
(1) When the stop mode is used, set the oscillation stop detection
function to “invalid”.
(2) When the ceramic or RC oscillation is stopped (bit 4 of CPU
mode register (address 003B16)), set the oscillation stop de-
tection function to “invalid”.
(3) The oscillation stop detection circuit is not included in the emu-
lator MCU “M37542RSS”.
2. Stop mode
(1) When the stop mode is used, set the oscillation stop detection
function to “invalid”.
(2) When the stop mode is used, set “0” to the STP instruction
function selection bit of the watchdog timer control register (bit
6 of watchdog timer control register (address 003916)).
(3) The oscillation stabilizing time after release of STP instruction
can be selected from “set automatically”/“not set automati-
cally” by the oscillation stabilizing time set bit after release of
the STP instruction (bit 0 of MISRG (address 003816)). When
“0” is set to this bit, “0116” is set to timer 1 and “FF16” is set to
prescaler 1 automatically at the execution of the STP instruc-
tion. When “1” is set to this bit, set the wait time to timer 1 and
prescaler 1 according to the oscillation stabilizing time of the
oscillation. Also, when timer 1 is used, set values again to
timer 1 and prescaler 1 after system is returned from the stop
mode.
(4) The STP instruction cannot be used when the on-chip oscilla-
tor is selected by the clock division ratio selection bits (bits 7
and 6 of CPU mode register (address 003B16)).
(5) When the stop mode is used, set the on-chip oscillator oscilla-
tion control bit (bit 3 of CPU mode register (address 003B16))
to “1” (on-chip oscillator oscillation stop).
(6) Do not execute the STP instruction during the A/D conversion.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37544G2GP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37544G2SP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37545G2KP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO32 |
| M37545G8-XXXGP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32 |
| M37545GC-XXXGP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37544G2ASP#U0 | 功能描述:MCU 2/5V 8K 32-SDIP 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: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) |
| M37544G2GP | 功能描述:IC 740 MCU OTP 8K 32LQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 產(chǎn)品培訓(xùn)模塊:MCU Product Line Introduction XMEGA Introduction AVR XMEGA USB Connectivity 標(biāo)準(zhǔn)包裝:90 系列:AVR® XMEGA 核心處理器:AVR 芯體尺寸:8/16-位 速度:32MHz 連通性:I²C，IrDA，SPI，UART/USART 外圍設(shè)備:欠壓檢測/復(fù)位，DMA，POR，PWM，WDT 輸入/輸出數(shù):50 程序存儲器容量:192KB（96K x 16） 程序存儲器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:16K x 8 電壓 - 電源 (Vcc/Vdd):1.6 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 16x12b; D/A 2x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:64-TQFP 包裝:托盤 配用:ATSTK600-RC14-ND - STK600 SOCKET/ADAPTER 64TQFPATSTK600-TQFP64-ND - STK600 SOCKET/ADAPTER 64-TQFPATAVRONEKIT-ND - KIT AVR/AVR32 DEBUGGER/PROGRMMRATAVRISP2-ND - PROGRAMMER AVR IN SYSTEM |
| M37544G2HP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37544G2SP | 功能描述:IC 740 MCU OTP 8K 32P4B RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 標(biāo)準(zhǔn)包裝:330 系列:- 核心處理器:- 芯體尺寸:8/16-位 速度:40MHz 連通性:UART/USART 外圍設(shè)備:DMA，PWM，WDT 輸入/輸出數(shù):32 程序存儲器容量:- 程序存儲器類型:外部程序存儲器 EEPROM 大小:- RAM 容量:- 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:100-BQFP 包裝:管件 |
| M37544M2-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。