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參數(shù)資料
| 型號： | W78E52 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MTP Monitor Microcontroller(多次可編程的8位的監(jiān)視微控制器) |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | DIP-40 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 284K |
| 代理商： | W78E52 |
W78E52
- 6 -
Clock
The W78E52 is designed to be used with either a crystal oscillator or an external clock. Internally, the
clock is divided by two before it is used. This makes the W78E52 relatively insensitive to duty cycle
variations in the clock.
Crystal Oscillator
The W78E52 incorporates a built-in crystal oscillator. To make the oscillator work, a crystal must be
connected across pins XTAL1 and XTAL2. In addition, a load capacitor must be connected from each
pin to ground, and a resistor must also be connected from XTAL1 to XTAL2 to provide a DC bias
when the crystal frequency is above 24 MHz.
External Clock
An external clock should be connected to pin XTAL1. Pin XTAL2 should be left unconnected. The
XTAL1 input is a CMOS-type input, as required by the crystal oscillator. As a result, the external clock
signal should have an input one level of greater than 3.5 volts.
Power Management
Idle Mode
The idle mode is entered by setting the IDL bit in the PCON register. In the idle mode, the internal
clock to the processor is stopped. The peripherals and the interrupt logic continue to be clocked. The
processor will exit idle mode when either an interrupt or a reset occurs.
Power-down Mode
When the PD bit of the PCON register is set, the processor enters the power-down mode. In this
mode all of the clocks are stopped, including the oscillator. The only way to exit power-down mode is
by a reset.
Power Reduction Function
The status of the external pins during the idle and power-down modes for the W78E52 is shown in the
following table.
ALE PSEN
1 1
1 1
0 0
0 0
P0
Data
Float
Data
Float
P1
Data
Data
Data
Data
P2
Data
Addr.
Data
Addr.
P3
Data
Data
Data
Data
Idle
Internal
External
Internal
External
Power
Down
Reset
The external RESET signal is sampled at S5P2. To take effect, it must be held high for at least two
machine cycles while the oscillator is running.
An internal trigger circuit in the reset line is used to deglitch the reset line when the W78E52 is used
with an external RC network. The reset logic also has a special glitch removal circuit that ignores
glitches on the reset line.
During reset, the ports are initialized to FFH, the stack pointer to 07H, PCON (with the exception of
bit 4) to 00H, and all of the other SFR registers except SBUF to 00H. SBUF is not reset.
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PDF描述 |
|---|---|
| W78E56B | 8-BIT Microcontroller(8位的微控制器) |
| W78E516BP-24 | 8-BIT MICROCONTROLLER |
| W78E516BP-40 | 8-BIT MICROCONTROLLER |
| W78E516 | 8-BIT MICROCONTROLLER |
| W78E516B | 8-BIT MICROCONTROLLER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| W78E52-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E52-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E52-33 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E52-40 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E52B | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
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