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| 型號(hào)： | W741E260 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT FLASH MICROCONTROLLER |
| 中文描述： | 4-BIT, FLASH, 4.19 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁(yè)數(shù)： | 11/94頁(yè) |
| 文件大小： | 554K |
| 代理商： | W741E260 |
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W741E260
Publication Release Date: March 1998
- 11 -
Revision A2
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.
System Clock
Generator
T1
T2
T3
T4
Main Oscillator
XIN1
XOUT1
Sub-oscillator
XIN2
XOUT2
Fosc
Divider 0
Fm
Fs
enable/disable
enable/disable
SCR.1
HOLD
SCR.0
LCD Frequency
Selector
F
LCD
Fosc
Fosc/32
Mask Option (High/Low Freq.)
Mask Option (Single/Dual Clock)
Divider 1
INT4
HCF.4
SCR.3 (14/13 bit)
Mask Option
(Single/Dual Clock)
Mask Option (High/Low Freq.)
Figure 4. The Dual Clock Operation Mode Control Diagram
W
W
W
0
1
2
3
SCR
Note: W means write only.
Bit 0 = 0 Main oscillator is selected (Fosc = Fm)
= 1 Sub-oscillator is selected (Fosc = Fs)
Bit 1 = 0 Enable Fm
= 1 Disable Fm
Bit 2 Reserved
Bit 3 = 0 14-bit Divider1 is selected
= 1 13-bit Divider1 is selected
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