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參數(shù)資料
| 型號(hào)： | W742E813 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT MICROCONTROLLER |
| 中文描述： | 4-BIT, FLASH, 3.58 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 2.75 MM HEIGHT, QFP-100 |
| 文件頁數(shù)： | 13/45頁 |
| 文件大小： | 567K |
| 代理商： | W742E813 |
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Preliminary W742E81A/W742C81A
Publication Release Date: April 2000
Revision A1
- 13 -
When the SCR is set or reset, we must care the following cases:
1. X000B
→
X011B: we should not exchange the F
OSC
from Fm into Fs and disable Fm
simultaneously. We could first exchange the F
OSC
from Fm into Fs, then disable the main-
oscillator. So it should be X000B
→
X001B
→
X011B.
2. X011B
→
X000B: we should not enable Fm and exchange the F
OSC
from Fs into Fm
simultaneously. We could first enable the main-oscillator; the 2nd step is calling a delay subroutine
to wait the main-oscillator oscillating stably; then exchange the F
OSC
from Fs into Fm is the last
step. So it should be X011B
→
X001B
→
delay the Fm oscillating stably time
→
X000B. The
suggestion of the Fm oscillating stably time is 3.5 mS for 455 KHz and 0.8ms for 4 MHz.
We must remember that the X010B state is inhibitive, because it will induce the system shutdown.
The organization of the dual-clock operation mode is shown in Figure 6-4.
System Clock
Generator
T1
T2
T3
T4
Main Oscillator
XIN1
XOUT1
Sub-Oscillator
XIN2
XOUT2
Fosc
Divider 0
SCR : System clock Control Register ( default = 00H )
Bit0
Bit1
Bit3
0 : Fosc = Fm
1 : Fosc = Fs
0 : Fm enable
1 : Fm disable
Fm
Fs
enable/disable
SCR.1
STOP
HOLD
SCR.0
LCD Frequency
Selector
F
LCD
Divider 1
INT4
HCF.4
SCR.3(14/12 bit)
1 : 12 bit
0 : 14 bit
Daul clock operation mode :
- SCR.0=0, Fosc=Fm : SCR.0=1, Fosc=Fs
- Flcd=Fs, In STOP mode LCD work continue.
Fosc/128
Dual/Single Colck
Option code is 1/0
Fs or Fosc/128
Figure 6-4 Organization of the dual-clock operation mode
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| W742E816 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W742E81A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W742S819 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT TELEPHONE CONTROLLER |
| W742S81A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4 BIT MICROCONTROLLER |
| W742S82A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT TELEPHONE CONTROLLER |
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