Overview
The MC9S12B128 microcontroller unit (MCU) is a 16-bit device composed of standard on-chip
peripherals including a 16-bit central processing unit (CPU12), 128K bytes of Flash EEPROM, 4K bytes of RAM, 1K bytes of EEPROM, two asynchronous serial communications interfaces (SCI), serial peripheral interface (SPI), an input capture/output compare timer (TIM), 16- channel, 10-bit
analog-to-digital converter (ADC), an 8-channel pulse-width modulator (PWM), one CAN 2.0 A, B
software compatible module (MSCAN12) and an Inter-IC Bus. The MC9S12B128 has full 16-bit data paths throughout, however, the external bus can operate in an 8-bit narrow mode so single 8-bit wide memory can be interfaced for lower cost systems. 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 in each module, up to 22 I/O ports are available with Wake-Up capability from STOP or WAIT mode.

Features
• HCS12 Core
– 16-bit 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
– MEBI (Multiplexed External Bus Interface)
– MMC (Module Mapping Control)
– INT (Interrupt control)
– BKP (Breakpoints)
– BDM (Background Debug Mode)
• CRG
– Low current Colpitts or
– Pierce oscillator,
– PLL,
– COP watchdog,
– Real time interrupt,
– Clock monitor
• 8-bit and 4-bit ports with interrupt functionality
– Digital filtering
– Programmable rising or falling edge trigger
• Memory
– 128K Flash EEPROM
– 1K byte EEPROM
– 4K byte RAM
• Analog-to-Digital Converter
– 16-channels for 112 Pin Package, 8 channels for 80 Pin package options
– 10-bit resolution
– External conversion trigger capability
• 1M bit per second, CAN 2.0 A, B software compatible module
– Five receive and three transmit buffers
– Flexible identifier filter programmable as 2 x 32 bit, 4 x 16 bit or 8x8bit
– Four separate interrupt channels for Rx, Tx, error and wake-up
– Low-pass filter wake-up function
– Loop-back for self test operation
• Input Capture/Output Compare Timer (TIM)
– 16-bit Counter with 7-bit Prescaler
– 8 programmable input capture or output compare channels
– 16-bit Pulse Accumulators
– Simple PWM Mode
– Modulo Reset of Timer Counter
– External Event Counting
– Gated Time Accumulation
• 8 PWM channels
– Programmable period and duty cycle
– 8-bit 8-channel or 16-bit 4-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
– Usable as interrupt inputs
• Serial interfaces
– Two asynchronous Serial Communications Interfaces (SCI)
– Synchronous Serial Peripheral Interface (SPI)
• Inter-IC Bus (IIC)
– Compatible with I2C Bus standard
– Multi-master operation
– Software programmable for one of 256 different serial clock frequencies
• Internal 2.5V Regulator
– Supports an input voltage range from 2.97V to 5.5V
– Low power mode capability
– Includes low voltage reset (LVR) circuitry
– Includes low voltage interrupt (LVI) circuitry
• 112-Pin LQFP or 80 QFP package
– I/O lines with 5V input and drive capability
– 5V A/D converter inputs
– Operation at 32 MHz equivalent to 16 MHz Bus Speed; Option 50MHz equivalent to 25MHz
Bus Speed
– Development support
– Single-wire background debug™ mode (BDM)
– On-chip hardware breakpoints