W78IRD2 datasheet(3/76 Pages) ETC2

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W78IRD2

Publication Release Date: October 2, 2006

- 3 -

Revision A7

GENERAL DESCRIPTION

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.

FEATURES

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8-bit CMOS microcontroller

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Pin-compatible with standard 80C52

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Instruction-set compatible with 80C52

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

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

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Three 16-bit timers

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Programmable clock out

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

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9 interrupt sources with 4 levels of priority

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

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

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

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256-byte on-chip RAM

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1-KB auxiliary RAM, software-selectable

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Software Reset

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

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

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2 DPTR registers

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Low EMI (inhibit ALE)

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

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Code protection

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Packages:

— Lead Free (RoHS) DIP 40:

W78IRD2A25DL

— Lead Free (RoHS) PLCC 44: W78IRD2A25PL

W78IRD2 Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers

W78IRD2 Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers

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