Architectural Overview
Zilog’s Z86E33/733/E34, E43/743/E44 8-Bit One-Time Programmable (OTP) Microcontrollers are members of Zilog’s single-chip Z8® MCU family featuring enhanced wake-up circuitry, programmable Watchdog Timers, Low Noise EMI options, and easy hardware/software system expansion capability.

Features
• Standard Temperature (VCC = 3.5 V to 5.5 V)
• Extended Temperature (VCC = 3.5 V to 5.5 V)
• Available Packages:
   – 28-Pin DIP/SOIC/PLCC OTP (E33/733/E34)
   – 40-Pin DIP OTP (E43/743/E44)
   – 44-Pin PLCC/LQFP OTP (E43/743/E44)
• Software Enabled Watchdog Timer (WDT)
• Push-Pull/Open-Drain Programmable
   on Port 0, Port 1, and Port 2
• 24/32 Input/Output Lines
• Clock-Free WDT Reset
• Auto Power-On Reset (POR)
• Programmable OTP Options:
   – RC Oscillator
   – EPROM Protect
   – Auto Latch Disable
   – Permanently Enabled WDT
   – Crystal Oscillator Feedback Resistor Disable
   – RAM Protect
• Low-Power Consumption: 60 mW
• Fast Instruction Pointer: 0.75 µs
• Two Standby Modes: STOP and HALT
• Digital Inputs CMOS Levels, Schmitt-Triggered
• Software Programmable Low EMI Mode
• Two Programmable 8-Bit Counter/Timers
   Each with a 6-Bit Programmable Prescaler
• Six Vectored, Priority Interrupts
   from Six Different Sources
• Two Comparators
• On-Chip Oscillator that Accepts a Crystal,
   Ceramic Resonator, LC, RC, or External Clock Drive