GENERAL DESCRIPTION
The W78E054D/W78E052D/W78E051D series is an 8-bit microcontroller which can accommodate a wider frequency range with low power consumption. The instruction set for the W78E054D/ W78E052D/ W78E051D series is fully compatible with the standard 8051.
The W78E054D/W78E052D/W78E051D series contains 16K/8K/4K bytes Flash EPROM programma-ble by hardware writer; a 256 bytes RAM; four 8-bit bi-directional (P0, P1, P2, P3) and bit-addressable I/O ports; an additional 4-bit I/O port P4; three 16-bit timer/counters; a hardware watchdog timer and a serial port. These peripherals are supported by 8 sources 4-level interrupt capability. To facilitate pro-gramming and verification, the Flash EPROM inside the W78E054D/W78E052D/W78E051D series allows the program memory to be programmed and read electronically. Once the code is confirmed, the user can protect the code for security.
The W78E054D/W78E052D/W78E051D series microcontroller has two power reduction modes, idle mode and power-down mode, both of which are software selectable. The idle mode turns off the proc-essor clock but allows for continued peripheral operation. The power-down mode stops the crystal os-cillator for minimum power consumption. The external clock can be stopped at any time and in any state without affecting the processor. The W78E054D/W78E052D/W78E051D series contains In-System Programmable (ISP) 2KB LD Flash EPROM for loader program, operating voltage from 3.3V to 5.5V.
FEATURES
• Fully static design 8-bit CMOS microcontroller
• Optional 12T or 6T mode
• Wide supply voltage of 2.4 to 5.5V
• Temperature grade is (-40oC~85oC)
• Pin and Instruction-set compatible with MCS-51
• 256 bytes of on-chip scratchpad RAM
• 16K/8K/4K bytes electrically erasable/programmable Flash EPROM
• 2K bytes LDROM support ISP function (Reference Application Note)
• 64KB program memory address space
• 64KB data memory address space
•12 clocks per machine cycle operation (default), Speed up to 40 MHz
• 6 clocks per machine cycle operation set by the writer, Speed up to 20 MHz
• Four 8-bit bi-directional ports with high sink current for LED driver
• 8-sources, 4-level interrupt capability
• One extra 4-bit bit-addressable I/O port, additional INT2/INT3 (available on PQFP, PLCC and LQFP package)
• Three 16-bit timer/counters
• One full duplex serial port
• Watchdog Timer
• EMI reduction mode
• Software Reset
• Built-in power management with idle mode and power down mode
• Code protection
• Packages:
-Lead Free (RoHS) DIP 40: W78E054DDG
-Lead Free (RoHS) PLCC 44: W78E054DPG
-Lead Free (RoHS) PQFP 44: W78E054DFG
-Lead Free (RoHS) LQFP 48: W78E054DLG
-Lead Free (RoHS) DIP 40: W78E052DDG
-Lead Free (RoHS) PLCC 44: W78E052DPG
-Lead Free (RoHS) PQFP 44: W78E052DFG
-Lead Free (RoHS) LQFP 48: W78E052DLG
-Lead Free (RoHS) DIP 40: W78E051DDG
-Lead Free (RoHS) PLCC 44: W78E051DPG
-Lead Free (RoHS) PQFP 44: W78E051DFG
-Lead Free (RoHS) LQFP 48: W78E051DLG
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W78E051D.pdf
