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Product Descriptions

The W78IRD2 is an 8-bit microcontroller which is pin- and instruction-set-compatible with the standard 80C52. The W78IRD2 contains a 64-KB Flash EPROM whose contents may be updated in-system by a loader program stored in an auxiliary, 4-KB Flash EPROM. Once the contents are confirmed, it can be protected for security. 

The W78IRD2 also contains 256 bytes of on-chip RAM; 1 KB of auxiliary RAM; four 8-bit, bi-directional and bit-addressable I/O ports; an additional 4-bit port P4; three 16-bit timer/counters; and a serial port. These peripherals are all supported by nine interrupt sources with 4 levels of priority. 

The W78IRD2 has two power-reduction modes: idle mode and power-down mode, both of which are software-selectable. Idle mode turns off the processor clock but allows peripherals to continue operating, while power-down mode stops the crystal oscillator for minimum power consumption. Power-down mode can be activated at any time and in any state without affecting the processor.

Product Features

? 8-bit CMOS microcontroller 

? Pin-compatible with standard 80C52 

? Instruction-set compatible with 80C52

? Four 8-bit I/O ports; Port 0 has internal pull-up resisters enabled by software

? One extra 4-bit I/O port with interrupt and chip-select functions 

? Three 16-bit timers

? Programmable clock out 

? Programmable Counter Array (PCA) with PWM, Capture, Compare and Watchdog functions

? 9 interrupt sources with 4 levels of priority 

? Full-duplex serial port with framing-error detection and automatic address recognition

? 64-KB, in-system-programmable, Flash EPROM (AP Flash EPRAOM) 

? 4-KB auxiliary Flash EPROM for loader program (LD Flash EPROM) 

? 256-byte on-chip RAM 

? 1-KB auxiliary RAM, software-selectable

? Software Reset 

? 12 clocks per machine cycle operation (default). Speed up to 20 MHz.

? 6 clocks per machine cycle operation set by the writer. Speed up to 12 MHz. 

? 2 DPTR registers

? Low EMI (inhibit ALE) 

? Built-in power management with idle mode and power down mode

? Code protection 

? Packages: 

— Lead Free (RoHS) DIP 40: W78IRD2A25DL 

— Lead Free (RoHS) PLCC 44: W78IRD2A25PL

Actual product photos

Product Data Manual:

For more product information, please download the PDF

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Official Certificate&Certificate

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