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參數資料
| 型號： | W77E516F-25 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數： | 62/85頁 |
| 文件大小： | 596K |
| 代理商： | W77E516F-25 |
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Preliminary W77E516
- 62 -
Programmable Clock-out
Timer 2 is equipped with a new clock-out feature which outputs a 50% duty cycle clock on P1.0. It
can be invoked as a programmable clock generator. To configure Timer 2 with clock-out mode,
software must initiate it by setting bit T2OE = 1, C/T2 = 0 and CP/RL = 0. Setting bit TR2 will start
the timer. This mode is similar to the baud rate generator mode, it will not generate an interrupt
while Timer 2 overflow. So it is possible to use Timer 2 as a baud rate generator and a clock
generator at the same time. The clock-out frequency is determined by the following equation:
The Clock-out Frequency = Oscillator Frequency / [4 X (65536-RCAP2H, RCAP2L)]
T2CON.6
TR2 = T2CON.2
T2EX = P1.1
EXEN2 = T2CON.3
EXF2
T2=P1.0
Timer 2
Interrupt
TH2
TL2
RCAP2H
RCAP2L
Clock Source
Mode input
div. by 4 osc/2
div. by 64 osc/32
div. by 1024 osc/512
1/2
Figure 18. Programmable Clock-Out Mode
Watchdog Timer
The Watchdog timer is a free-running timer which can be programmed by the user to serve as a
system monitor, a time-base generator or an event timer. It is basically a set of dividers that divide the
system clock. The divider output is selectable and determines the time-out interval. When the time-out
occurs a flag is set, which can cause an interrupt if enabled, and a system reset can also be caused if
it is enabled. The interrupt will occur if the individual interrupt enable and the global enable are set. The
interrupt and reset functions are independent of each other and may be used separately or together
depending on the users software.
16
WD1,WD0
00
01
10
11
Interrupt
Enable Watchdog timer reset
EWT(WDCON.1)
Reset Watchdog
RWT (WDCON.0)
0
17
19
20
22
23
25
Time-out
WDIF
WTRF
512 clock
delay
EWDI(EIE.4)
Clock Source
Mode input
div. by 4 osc/1
div. by 64 osc/16
div. by 1024 osc/256
Reset
Figure 19. Watchdog Timer
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| W77E516F-40 | 8-BIT MICROCONTROLLER |
| W77E516P-25 | 8-BIT MICROCONTROLLER |
| W77E516P-40 | 8-BIT MICROCONTROLLER |
| W77E532 | 8 BIT MICROCONTROLLER |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W77E516F-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516P-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516P-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E532 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77E532_07 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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