Introduction
The MC9S12E128 is a 112/80/64 pin low cost general purpose MCU comprised of standard on-chip peripherals including a 16-bit central processing unit (HCS12 CPU), up to 128K bytes of Flash EEPROM, up to 8K bytes of RAM, three asynchronous serial communications interface modules (SCI), a serial peripheral interface (SPI), an Inter-IC Bus (IIC), three 4-channel 16-bit timer modules (TIM), a 6-channel 15-bit Pulse Modulator with Fault protection module (PMF), a 6-channel 8-bit Pulse Width Modulator (PWM), a 16-channel 10-bit analog-to-digital converter (ADC), and two 1-channel 8-bit digital-to-analog converters (DAC). The MC9S12E128 has full 16-bit data paths throughout. The inclusion of a PLL circuit allows power consumption and performance to be adjusted to suit operational requirements. In addition to the I/O ports available on each module, 16 dedicated I/O port bits are available with Wake-Up capability from STOP or WAIT mode. Furthermore, an on chip bandgap based voltage regulator (VREG) generates
the internal digital supply voltage of 2.5V (VDD) from a 3.135V to 5.5V external supply range.

FEATUREs
• 16-bit HCS12 CORE
— HCS12 CPU
– i. Upward compatible with M68HC11 instruction set
– ii. Interrupt stacking and programmer’s model identical to M68HC11
– iii. Instruction queue
– iv. Enhanced indexed addressing
— Module Mapping Control (MMC)
— Interrupt control (INT)
— Background Debug Module (BDM)
— Debugger (DBG12) including breakpoints and change-of-flow trace buffer
— Multiplexed External Bus Interface (MEBI)
• Wake-Up interrupt inputs
— Up to 16 port bits available for wake up interrupt function with digital filtering
• Memory Options
— 32K, 64K or 128K Byte Flash EEPROM
— 2K, 4K or 8K Byte RAM
• Two 1-channel Digital-to-Analog Converters (DAC)
— 8-bit resolution
• Analog-to-Digital Converter (ADC)
— 16-channel module with 10-bit resolution
— External conversion trigger capability
• Three 4-channel Timers (TIM)
— Programmable input capture or output compare channels
— Simple PWM mode
— Counter modulo reset
— External event counting
— Gated time accumulation
• 6 PWM channels (PWM)
— Programmable period and duty cycle
— 8-bit 6-channel or 16-bit 3-channel
— Separate control for each pulse width and duty cycle
— Center-aligned or left-aligned outputs
— Programmable clock select logic with a wide range of frequencies
— Fast emergency shutdown input
• 6-channel Pulse width Modulator with Fault protection (PMF)
— Three independent 15-bit counters with synchronous mode
— Complementary channel operation
— Edge and center aligned PWM signals
— Programmable dead time insertion
— Integral reload rates from 1 to 16
— Four fault protection shut down input pins
— Three current sense input pins
• Serial interfaces
— Three asynchronous serial communication interfaces (SCI)
— Synchronous serial peripheral interface (SPI)
— Inter-IC Bus (IIC)
• Clock and Reset Generator (CRG)
— Windowed COP watchdog
— Real Time interrupt
— Clock Monitor
— Pierce or low current Colpitts oscillator
— Phase-locked loop clock frequency multiplier
— Self Clock mode in absence of external clock
— Low power 0.5 to 16Mhz crystal oscillator reference clock
• Operating frequency
— 50MHz equivalent to 25MHz Bus Speed
• Internal 2.5V Regulator
— Input voltage range from 3.135V to 5.5V
— Low power mode capability
— Includes low voltage reset (LVR) circuitry
— Includes low voltage interrupt (LVI) circuitry
• 112-Pin LQFP or 80-Pin QFP or 64-Pin QFN package
— Up to 90 I/O lines with 5V input and drive capability (112 pin package)
— Up to two dedicated 5V input only lines (IRQ and XIRQ)
— Sixteen 3.3V/5V A/D converter inputs
• Development Support.
— Single-wire background debugTM mode
— On-chip hardware breakpoints
— Enhanced debug features