- 您現在的位置：買賣IC網 > PDF目錄363894 > W741C20X (WINBOND ELECTRONICS CORP) 4-BIT MICROCONTROLLER PDF資料下載
參數資料
| 型號： | W741C20X |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 4-BIT MICROCONTROLLER |
| 中文描述： | 4位微控制器 |
| 文件頁數： | 12/84頁 |
| 文件大小： | 486K |
| 代理商： | W741C20X |
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頁當前第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
Preliminary W741C20X
- 12 -
Timer 1 (TM1)
Timer 1 (TM1) is also a programmable 8-bit binary down counter, as shown in Figure 6. Timer 1 can
be used as a counter to count external events or to output an arbitrary frequency to the MFP pin. The
input clock of Timer 1 can be one of three sources: Fosc/64, Fosc, or an external clock from the RC.0
input pin. The source can be selected by setting bit 0 and bit 1 of mode register 1 (MR1). At initial
reset, the Timer 1 clock input is Fosc. If an external clock is selected as the clock source of Timer 1,
the content of Timer 1 is decreased by 1 at the falling edge of RC.0. When the MOV TM1L, R or
MOV TM1H,R instruction is executed, the specified data are loaded into the auto-reload buffer and
the TM1 down-counting will be disabled (i.e. MR1.3 is reset to 0). If the bit 3 of MR1 is set (MR1.3 =
1), the contents of the auto-reload buffer will be loaded into the TM1 down counter, Timer 1 starts to
down count, and the event flag 7 is reset (EVF.7 = 0). When the MOV TM1, #I instruction is executed,
the event flag 7 (EVF.7) and MR1.3 are reset and the specified value is loaded into auto-reload buffer
and TM1 by the internal hardware, then the MR1.3 is set, that is the TM1 starts to count by the
hardware. When the timer decrements to FFH, it will generate an underflow (EVF.7 = 1) and be
auto-reloaded with the specified data, after which it will continue to count down. An interrupt is
executed if the interrupt enable flag 7 has been set to 1 (IEF.7 = 1), and the hold state is terminated if
the hold mode release enable flag 7 is set to 1 (HEF.7 = 1). The specified frequency of Timer 1 can
be delivered to the MFP output pin by programming bit 2 of MR1. Bit 3 of MR1 can be used to make
Timer 1 stop or start counting.
If the Timer 1 clock input is F
T, then
:
Desired Timer 1 interval = (preset value +1) / F
T
Desired frequency for MFP output pin = F
T
÷
(preset value + 1)
÷
2 (Hz)
Preset value: Decimal number of Timer 1 preset value, and
F
OSC
: Clock oscillation frequency
Auto-reload buffer
8 bits
MR1.1
External clock
via RC.0
1. MR1.3 = 1
2. MOV TM1, #I
Underflow
signal
EVF.7
MFP
MFP signal
MR1.2
output pin
8-bit Binary
Down Counter
(Timer 1)
2
circuit
Reset
Reset
Disable
Enable
Fosc/64
Fosc
MR1.0
S
R
Q
1. Reset
2. INT 7 accept
3. CLR EVF, #80H
4. Set MR1.3 to 1
5. MOV TM1, #I
T
F
1. MR1.3 = 0
4
4
MOV TM1H, R
MOV TM1L, R
Set MR1.3 to 1
MOV TM1, #I
8
MOV TM1, #I
Figure 6. Organization of Timer 1
相關PDF資料 |
PDF描述 |
|---|---|
| W741C240 | 4-BIT Microcontroller(多次可編程4位的微控制器) |
| W741C250 | 4-BIT Microcontroller(多次可編程4位的微控制器) |
| W741C260 | 4-BIT Microcontroller(多次可編程4位的微控制器) |
| W741E20X | 4-BIT FLASH MICROCONTROLLER |
| W741E260 | 4-BIT FLASH MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W741C250 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| W741C260 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER |
| 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 |
發布緊急采購，3分鐘左右您將得到回復。