PIC vs. HCS12

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PIC vs. HCS12

• By Bill Eisenhower

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MicroChip PIC16

• Small, Cheap, 8-bit Microcontroller
• 8-bit RISC ALU
• Timers
• 10-bit A/D
• Serial Parallel Ports
• 28 or 40 DIP packaging
• Popular with ECE445 students for ease of use

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Freescale HCS12

• Full Featured 16-bit Microcontroller
• 16-bit CISC ALU
• All features of PIC and more
• Has more of all features
• More Expensive 15-20 each
• Much more memory 256KB flash, 12KB SRAM
• 80 or 112 pin QFP packaging
• Brand new option for ECE445

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PIC16 vs. HCS12- On Chip Memory

• PIC
• 8K instructions
• 368 bytes of RAM
• 256 bytes of EEPROM

• HCS12
• 256KB Flash
• Instructions of various sizes
• 12KB of RAM
• 4KB of EEPROM

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PIC16 vs. HCS12- Analog to Digital

• PIC
• 8 channels
• 10-bit resolution
• Poll-able or Interrupt driven results
• Only Holds 1 result

• HCS12
• 16 channels
• 10-bit resolution
• Poll-able or Interrupt driven results
• Holds 16 results

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PIC16 vs. HCS12- Peripherals

• PIC
• 3 Timers
• 2 8-bit
• 1 16-bit
• 2 PWM/Comparison
• 1 SPI/IIC Serial Port
• 1 UART Serial Port
• 1 Slave Serial Port

• HCS12
• 8 Timer/Comparison
• 16-bit
• Pulse Accumulator
• 8 PWM
• 8 8-bit or 4 16-bit
• 3 SPI Serial Ports
• 1 IIC Serial Port
• 2 UART Serial Port
• 2 CAN Ports

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PIC16 vs. HCS12- I/O and Speed

• PIC
• Up to 33 I/O bits
• Selectable 0-20MHz operation

• HCS12
• Up to 91 I/O bits
• If not uses for other modules
• Many with interrupts
• Quasi-Fixed 24 MHz operation

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HCS12 Prototyping Board

• Pins out HCS12 with protection up to 13V
• Has Serial port level changer chip (MAX232)
• Allows for easy prototyping of design

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HCS12 Prototyping Board

• Serial connection to computer to program and
  debug
• Uses CodeWarrior IDE
• Not usable in application

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HCS12 Prototyping Board

• Serial connections for application
• Upper (Female) port to use HCS12 as a device
• Lower (Male) port to be use HCS12 as a host
• Connect to another device

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HCS12 Prototyping Board

• Mode selection switch
• Up (toward 5V jack) is to program and debug with
  computer
• Down (toward Gnd jack) is for program to run
  after reset

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HCS12 Prototyping Board

• Power Jacks
• 5 Volts and Ground
• Reset Switch

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HCS12 Prototyping Board

• Sound Transducer
• HCS12 chirps when reset
• AC Coupled to PT5
• Can be used to make sound in application

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HCS12 Prototyping Board

• Pinout Connection
• Input Protection

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Input Protection

• Designed to protect input pins up to 13 Volts
• Still have to be careful about static when
  handling HCS12 socket
• There is capacitive coupling in zener diode array

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HCS12 Module

• MC9S12DG256
• 112 LQFP
• Do NOT Touch due to static risks

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HCS12 Module

• 16 MHz Crystal
• Used generate for clock for MCU

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HCS12 Module

• PLL Filter
• Used to bump clock speed up to 24MHz

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HCS12 Module

• Brown-out Monitor
• Pull reset if power dips too low

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HCS12 Module

• Connection Pins
• Again do not touch for static issues

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HCS12 Module

• XIRQ, IRQ, and Reset all pulled up on module
• All power pins are connected together
• Same for ground pins
• MCU has bypass caps on board

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CodeWarrior

• Available for free from Freescale
• CodeWarrior for HCS12(X)
• http//tinyurl.com/ECE445CW
• http//www.freescale.com/lgfiles/devsuites/HC12/CW
  HCS12X_v4.7_Special.exe?fpsp1WT_TYPEIDE20-20D
  ebug,20Compile20and20Build20ToolsWT_VENDORFR
  EESCALEWT_FILE_FORMATexeWT_ASSETDownloads
• Wiki has blank CodeWarrior Project, Eagle
  library, and documentation