- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363894 > W741C260 (WINBOND ELECTRONICS CORP) 4-BIT Microcontroller(多次可編程4位的微控制器) PDF資料下載
參數(shù)資料
| 型號(hào)： | W741C260 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT Microcontroller(多次可編程4位的微控制器) |
| 中文描述： | 4-BIT, MROM, 4.19 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數(shù)： | 9/92頁 |
| 文件大小： | 488K |
| 代理商： | W741C260 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當(dāng)前第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頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁
W741C260
Publication Release Date: March 1998
- 9 -
Revision A3
XIN1
XOUT1
XIN2
XOUT2
or
32 KHz or
400K to 4MHz
Crystal
Crystal
32 KHz
Resistor
Figure 3. Oscillator Configuration
Dual-clock operation
This operation mode is selected by code option. In the dual-clock mode, the clock source of the LCD
frequency selector should be the sub-oscillator clock (32768 Hz) only. But in the single-clock mode,
the clock source of the LCD frequency selector will be Fm or Fm/32 (Fm: main oscillator clock).
In this dual-clock mode, the normal operation is performed by generating the system clock from the
main-oscillator clock (Fm). As required, the slow operation can be performed by generating the
system clock from the sub-oscillator clock (Fs). The exchange of the normal operation and the slow
operation is performed by resetting or setting the bit 0 of the system clock control register (SCR). If
the SCR.0 is reset to 0, the clock source of the system clock generator is the main-oscillator clock; if
the SCR.0 is set to 1, the clock source of the system clock generator is the sub-oscillator clock. In
dual-clock mode, the main-oscillator can stop oscillating when SCR.1 is set to 1. But in the single-
clock mode, the main-oscillator can not be stop from oscillating because the SCR would be disabled
in single-clock mode. Therefore, in sigle-clock mode, the clock source of the system clock generator
is the main-oscillator clock (F
OSC
= Fm).
When the SCR is set or reset, we must pay attention to the following:
1. X000B
→
X011B: Disable the main-oscillator (Fm) should not be done simultaneously with
changing the system clock source (F
OSC
) from Fm to Fs. The F
OSC
should be changed first from
Fm to Fs before the main-oscillator (Fm) is disabled. The correct seqence is:
X000B
→
X001B
→
X011B.
2. X011B
→
X000B: Enabling the main-oscillator (Fm) should not be done simultaneously with
changing the F
OSC
from Fs into Fm. The main-oscillator (Fm) should be enabled first before a
delay subroutine is called to allow the main-oscillator to oscillate stably. The F
OSC
can now be
changed from Fs into Fm. The correct sequence is therefore X011B
→
X001B
→
delay
subroutine
→
X000B. The suggested delay for Fm is 20 mS for 455 KHz ceramic resonator and 10
mS for 4 MHz crystal.
We must remember that the X010B state is inhibitive, because it will induce a system shutdown.
The organization of the dual-clock operation mode is shown below.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W741E20X | 4-BIT FLASH MICROCONTROLLER |
| W741E260 | 4-BIT FLASH MICROCONTROLLER |
| W741L260 | 4-BIT MICROCONTROLLER |
| W742C810 | 4-BIT MICROCONTROLLER |
| W742C813 | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W741E200 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| W741E201 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT FLASH MICROCONTROLLER |
| W741E202 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT FLASH MICROCONTROLLER |
| W741E203 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT FLASH MICROCONTROLLER |
| W741E204 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT FLASH MICROCONTROLLER |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。