Overview

The MC9S12H256 microcontroller unit (MCU) is a 16-bit device composed of standard on-chip

peripherals including a 16-bit central processing unit (HCS12 CPU), 256K bytes of Flash EEPROM, 12K bytes of RAM, 4K bytes of EEPROM, two asynchronous serial communications interfaces (SCI), a serial peripheral interface (SPI), an IIC-bus interface (IIC), an 8-channel 16-bit timer (TIM), a 16-channel, 10-bit analog-to-digital converter (ATD), a six-channel pulse width modulator (PWM), and two CAN 2.0 A, B software compatible modules (MSCAN).

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.20-bit ALU

iv. Instruction queue

v. Enhanced indexed addressing

– MEBI (Multiplexed External Bus Interface)

– MMC (Module Mapping Control)

– INT (Interrupt control)

– BKP (Breakpoints)

– BDM (Background Debug Mode)

• CRG (low current oscillator, PLL, reset, clocks, 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, 256K Flash EEPROM

– 2K, 4K byte EEPROM

– 6K, 12K byte RAM

• Analog-to-Digital Converter

– 8, 16 channels, 10-bit resolution

– External conversion trigger capability

• Two 1M bit per second, CAN 2.0 A, B software compatible modules

– 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

• Timer

– 16-bit main counter with 7-bit prescaler

– 8 programmable input capture or output compare channels

– Two 8-bit or one 16-bit pulse accumulators

• 2, 6 PWM channels

– Programmable period and duty cycle

– 8-bit 2, 6-channel or 16-bit 1, 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

• Serial interfaces

– Two asynchronous Serial Communications Interfaces (SCI)

– Synchronous Serial Peripheral Interface (SPI)

– Inter-Integrated Circuit interface (IIC)

• Liquid Crystal Display driver with variable input voltage

– Configurable for up to 32 frontplanes and 4 backplanes or general purpose input or output

– 5 modes of operation allow for different display sizes to meet application requirements

– Unused frontplane and backplane pins can be used as general purpose I/O

• 16, 24 high current drivers suited for PWM motor control

– Each PWM channel switchable between two drivers in an H-bridge configuration

– Left, right and center aligned outputs

– Support for sine and cosine drive

– Dithering

– Output slew rate control

• 144-Pin or 112-Pin LQFP package

– I/O lines with 5V input and drive capability

– 5V A/D converter inputs

– Operation at 32MHz equivalent to 16MHz Bus Speed

– Development support

– Single-wire background debug™ mode (BDM)

– On-chip hardware breakpoints