●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
