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GENERAL DESCRIPTION

Zilog’s Z8E520 (OTP) and Z8C520 (Masked ROM) microcontrollers are low-power Z8Plus MCUs, designed for the cost-effective implementation of USB and multiprotocol pointing devices.

FEATURES

■ Six Vectored Interrupts with Fixed Priority

■ Processor Speed Dividable by Firmware Control

■ Operating Current: 5 mA typical in USB Mode; 2.5 mA

typical in Serial Mode (@ 3 MHz); 5 mA typical in PS/2

Mode

■ 16 Total Input/Output Pins (Open-Drain/Push-Pull)

Configurable

■ 6 inputs with 3 level Programmable Reference

Comparators

■ 16-Bit Programmable Watch-Dog Timer (WDT) with

Internal RC Oscillator

■ Software Programmable Timers Configurable as:

– Two 8-Bit Standard Timers and One 16-Bit

Standard Timer or

– One 16-Bit Standard Timer and One 16-Bit Pulse

Width Modulator (PWM) Timer

■ Identical Masked ROM Version (Z8C520)

■ On-Chip Oscillator that accepts a Ceramic Resonator or

External Clock

■ Hardware Support for PS/2, Serial, USB, and GeneralPurpose I/O (GPIO)

■ Power Reduction Modes:

– STOP Mode (functionality shut down except SMR)

– HALT Mode (XTAL still running-peripherals active)

■ USB SIE Compliant with USB Spec 1.0

■ 4.0 VDC to 6.0 VDC Operating Range @ 0°C to +70°C