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MC9S12H256 Device User Guide — V01.18

Section 1 Introduction

1.1 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).

The MC9S12H128 microcontroller unit (MCU) is a 16-bit device composed of standard on-chip

peripherals including a 16-bit central processing unit (HCS12 CPU), 128K bytes of Flash EEPROM, 6K

bytes of RAM, 2K bytes of EEPROM, one asynchronous serial communications interface (SCI), a serial

peripheral interface (SPI), an IIC-bus interface (IIC), an 8-channel 16-bit timer (TIM), a 8-channel, 10-bit

analog-to-digital converter (ATD), a two-channel pulse width modulator (PWM), and two CAN 2.0 A, B

software compatible modules (MSCAN).

In addition, it features a 32x4 liquid crystal display (LCD) controller/driver and a motor pulse width

modulator (MC) consisting of 24 high current outputs suited to drive up to 6 stepper motors. System

resource mapping, clock generation, interrupt control, and bus interfacing are managed by the HCS12

Core.

The MC9S12H256 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 in each module, 12 general purpose I/O pins are available with interrupt and wake-up capability

from STOP or WAIT mode.

1.2 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)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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