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W78E52-40

更新时间： 2024-11-19 23:41:39
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23页 305K
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8-Bit Microcontroller

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W78E52-40 数据手册

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W78E54  
8-BIT MICROCONTROLLER  
GENERAL DESCRIPTION  
The W78E54 is an 8-bit microcontroller that is functionally compatible with the W78C54, except that  
the mask ROM is replaced by a flash EEPROM with a size of 16 KB. To facilitate programming and  
verification, the flash EEPROM inside the W78E54 allows the program memory to be programmed  
and read electronically. Once the code is confirmed, the user can protect the code for security.  
The W78E54 microcontroller supplies a wider frequency range than most 8-bit microcontrollers on the  
market. It is functionally compatible with the industry-standard 80C52 microcontroller series, except  
that one extra 4-bit bit-addressable I/O port (Port 4) and two additional external interrupts (INT2 ,  
INT3 ).  
The W78E54 contains four 8-bit bidirectional and bit-addressable I/O ports, three 16-bit  
timer/counters, and a serial port. These peripherals are supported by a eight-source, two-level  
interrupt capability. There are 256 bytes of RAM and an 16 KB flash EEPROM for application  
programs.  
The W78E54 microcontroller has two power reduction modes, idle mode and power-down mode, both  
of which are software selectable. The idle mode turns off the processor clock but allows for continued  
peripheral operation. The power-down mode stops the crystal oscillator for minimum power  
consumption. The external clock can be stopped at any time and in any state without affecting the  
processor.  
FEATURES  
· 8-bit CMOS microcontroller  
· Fully static design  
· Low standby current at full supply voltage  
· DC-40 MHz operation  
· 256 bytes of on-chip scratchpad RAM  
· 16 KB electrically erasable/programmable EPROM  
· 64 KB program memory address space  
· 64 KB data memory address space  
· Four 8-bit bidirectional ports  
· One extra 4-bit bit-addressable I/O port, additional INT2 / INT3  
(available on 44-pin PLCC/QFP package)  
· Three 16-bit timer/counters  
· One full duplex serial port  
· Boolean processor  
· Eight-source, two-level interrupt capability  
· Built-in power management  
· Code protection mechanism  
· Packages:  
- DIP 40: W78E54-16/24/40  
- PLCC 44: W78E54P-16/24/40  
- QFP 44: W78E54F-16/24/40  
- TQFP 44: W78E54M-16/24/40  
Publication Release Date: November 1997  
- 1 -  
Revision A2  
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 		Microcontroller, 8-Bit, FLASH, 8051 CPU, 40MHz, CMOS, PQCC44
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