- 您現在的位置：買賣IC網 > PDF目錄363894 > W742C813 (WINBOND ELECTRONICS CORP) 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER PDF資料下載
參數資料
| 型號： | W742C813 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4-BIT, MROM, 3.58 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 2.75 MM HEIGHT, QFP-100 |
| 文件頁數： | 17/56頁 |
| 文件大小： | 455K |
| 代理商： | W742C813 |
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頁當前第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
W742E/C813
Publication Release Date: December 2000
- 17 -
Revision A1
5.8 Sub-oscillator
The sub-oscillator is used in dual-clock operation mode. In the sub-oscillator application, just only the
32768 Hz crystal could be connected to XIN2 and XOUT2.
5.9 Dividers
Divider 0 is organized with a 14-bit binary up-counter that is designed to generate periodic interrupt.
When the main clock starts action, the Divider0 is incremented by each clock (F
OSC
). The main clock
can come from main oscillator or sub-oscillator by setting SCR register. When an overflow occurs, the
Divider0 event flag is set to 1 (EVF.0 = 1). Then, if the Divider0 interrupt enable flag has been set
(IEF.0 = 1), the interrupt is executed, while if the hold release enable flag has been set (HEF.0 = 1), the
hold state is terminated. And the last 4-stage of the Divider0 can be reset by executing
CLR DIVR0
instruction. If the main clock is connected to the 32.768K Hz crystal, the EVF.0 will be set to 1
periodically at the period of 500 mS.
Divider 1 is orginized with 13/12 bits up-counter that only has sub-oscillator clock source. If the sub-
oscillator starts action, the Divider1 is incremented by each clock (Fs). When an overflow occurs, the
Divider1 event flag is set to 1 (EVF.4 = 1). Then, if the Divider1 interrupt enable flag has been set
(IEF.4 = 1), the interrupt is executed, while if the hold release enable flag has been set (HEF.4 = 1), the
hold state is terminated. And the last 4-stage of the Divider1 can be reset by executing CLR DIVR1
instruction. There are two period time (125 mS & 250 mS) that can be selected by setting the SCR.3
bit. When SCR.3 = 0 (default), the 250 mS period time is selected; SCR.3 = 1, the 125 mS period time
is selected.
5.10 Dual-clock Operation
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 setting the bit 0 of the System clock Control Register (SCR). If the SCR.0 is set to 0,
the clock source of the system clock generator is main-oscillator clock; if the SCR.0 is set to 1, the
clock source of the system clock generator is sub-oscillator clock. In the dual-clock mode, the main-
oscillator can stop oscillating when the SCR.1 is set to 1. When the main clock switch, we must care
the following cases:
1. X000B
→
X011B (F
OSC
= Fm
→
F
OSC
= Fs): 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 (F
OSC
= Fs
→
F
OSC
= Fm): 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 stabely; then exchange the F
OSC
from Fs into Fm is
the last step. So it should be
X011B
X001B
delay the Fm oscillating stable time
X000B
.
相關PDF資料 |
PDF描述 |
|---|---|
| W742C814 | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| W742E813 | 4-BIT MICROCONTROLLER |
| W742C81A | 4-BIT MICROCONTROLLER |
| W742S819 | 4-BIT TELEPHONE CONTROLLER |
| W742S81A | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W742C814 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4 BIT MICROCONTROLLER |
| W742C816 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W742C818 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| W742C81A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| W742CE811 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
發布緊急采購，3分鐘左右您將得到回復。