W78E052D 概述

The W78E052D contains 8K bytes Flash EPROM programmable 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 programming and verification, the Flash EPROM inside the W78E052D allows the program memory to be programmed and read electronically. Once the code is confirmed, the user can protect the code for security.

The W78E052D 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. The W78E052D contains In-System Programmable (ISP) 2KB AP Flash EPROM for loader program; operating voltage from 2.4V to 5.5V.

W78E052D 特性

W78E052D 主要特性如下：
• Fully static design 8-bit CMOS microcontroller
• Pin and Instruction-set compatible with 80C52
• 256 bytes of on-chip scratchpad RAM
• 8K bytes electrically erasable/programmable Flash EPROM
• 2K bytes LDROM support ISP function
• 64KB program memory address space
• 64KB data memory address space
• 12 clocks per machine cycle operation (default), Speed up to 40 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 / (available on PQFP, PLCC and LQFP package)
• Three 16-bit timer/counters
• One full duplex serial port
• Watchdog Timer
• Eight sources, two-level interrupt capability
• EMI reduction mode
• Software Reset
• Built-in power management with idle mode and power down mode
• Code protection