- 您現在的位置：買賣IC網 > PDF目錄363900 > W78LE51F-24 (WINBOND ELECTRONICS CORP) 8-BIT MTP MICROCONTROLLER PDF資料下載
參數資料
| 型號： | W78LE51F-24 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MTP MICROCONTROLLER |
| 中文描述： | 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數： | 6/21頁 |
| 文件大小： | 304K |
| 代理商： | W78LE51F-24 |
Preliminary W78LE51
- 6 -
is useless. Turning off the ALE signal transition only requires setting the bit 0 of the AUXR SFR,
which is located at 08Eh. When ALE is turned off, it will be reactivated when the program accesses
external ROM/RAM data or jumps to execute an external ROM code. The ALE signal will turn off
again after it has been completely accessed or the program returns to internal ROM code space. The
AO bit in the AUXR register, when set, disables the ALE output. In order to reduce EMI emission from
oscillation circuitry, W78LE51 allows user to diminish the gain of on-chip oscillator amplifiers by using
programmer to clear the B7 bit of security register. Once B7 is set to 0, a half of gain will be
decreased. Care must be taken if user attempts to diminish the gain of oscillator amplifier, reducing a
half of gain may effect to external crystal operating improperly at high frequency above 24 MHz. The
value of R and C1,C2 may need some adjustment while running at lower gain.
***AUXR - Auxiliary register (8EH)
-
-
-
-
-
-
-
AO
AO: Turn off ALE output.
4. Power-off Flag
***PCON - Power control (87H)
-
-
-
POF
GF1
GF0
PD
IDL
POF:
Power off flag. Bit is set by hardware when power on reset. It can be cleared by software
to determine chip reset is a warm boot or cold boot.
GF1, GF0: These two bits are general-purpose flag bits for the user.
PD:
Power down mode bit. Set it to enter power down mode.
IDL:
Idle mode bit. Set it to enter idle mode.
The power-off flag is located at PCON.4. This bit is set when V
DD
has been applied to the part. It can
be used to determine if a reset is a warm boot or a cold boot if it is subsequently reset by software.
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 system reset can also be caused if it is enabled. The main use of the Watchdog
timer is as a system monitor. This is important in real-time control applications. In case of power
glitches or electro-magnetic interference, the processor may begin to execute errant code. If this is
left unchecked the entire system may crash. The watchdog time-out selection will result in different
time-out values depending on the clock speed. The Watchdog timer will de disabled on reset. In
general, software should restart the Watchdog timer to put it into a known state. The control bits that
support the Watchdog timer are discussed below.
Watchdog Timer Control Register
Bit:
7
6
5
4
-
3
-
2
1
0
ENW
Mnemonic: WDTC
CLRW
WIDL
PS2
PS1
PS0
Address: 8FH
ENW : Enable watch-dog if set.
相關PDF資料 |
PDF描述 |
|---|---|
| W78LE51 | 8-BIT MTP MICROCONTROLLER |
| W78LE51-24 | 8-BIT MTP MICROCONTROLLER |
| W78LE51P-24 | 8-BIT MTP MICROCONTROLLER |
| W78LE52 | 8-BIT MTP MICROCONTROLLER |
| W78LE52-24 | 8-BIT MTP MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W78LE51P-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
| W78LE52 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
| W78LE52_06 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78LE52-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
| W78LE52C | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
發布緊急采購，3分鐘左右您將得到回復。