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68HC908GP20: Microcontroller

 

The MC68HC908GP20 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs). All MCUs in the family use the enhanced M68HC08 central processor unit (CPU08) and are available with a variety of modules, memory sizes and types, and package types.
Page Contents
68HC908GP20 Features

  • High-performance M68HC08 architecture optimized for C-compilers
  • Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
  • 8-MHz internal bus frequency
  • FLASH program memory security 1
  • On-chip programming firmware for use with host personal computer which does not require high voltage for entry
  • In-system programming
  • System protection features:
    • Optional computer operating properly (COP) reset
    • Low-voltage detection with optional reset and selectable trip points for 3.0-V and 5.0-V operation
    • Illegal opcode detection with reset
    • Illegal address detection with reset
  • Low-power design; fully static with stop and wait modes
  • Standard low-power modes of operation:
    • Wait mode
    • Stop mode
  • Master reset pin and power-on reset (POR)
  • 20 Kbytes of on-chip FLASH memory with in-circuit programming capabilities of FLASH program memory
  • 512 bytes of on-chip random-access memory (RAM)
  • Serial peripheral interface module (SPI)
  • Serial communications interface module (SCI)
  • Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture, output compare, and PWM capability on each channel
  • 8-channel, 8-bit successive approximation analog-to-digital converter (ADC)
  • BREAK module (BRK) to allow single breakpoint setting during in-circuit debugging
  • Internal pullups on IRQ and RST to reduce customer system cost
  • Clock generator module with on-chip 32-kHz crystal compatible PLL (phase-lock loop)
  • Up to 33 general-purpose input/output (I/O) pins, including:
  • 26 shared-function I/O pins
  • Five or seven dedicated I/O pins, depending on package choice
  • Selectable pullups on inputs only on ports A, C, and D. Selection is on an individual port bit basis. During output mode, pullups are disengaged.
  • High current 10-mA sink/10-mA source capability on all port pins
  • Higher current 15-mA sink/source capability on PTC0&endash;PTC4
  • Timebase module with clock prescaler circuitry for eight user selectable periodic real-time interrupts with optional active clock source during stop mode for periodic wakeup from stop using an external 32-kHz crystal
  • Oscillator stop mode enable bit (OSCSTOPENB) in the CONFIG register to allow user selection of having the oscillator enabled ordisabled during stop mode
  • 8-bit keyboard wakeup port
  • 5-mA maximum current injection on all port pins to maintain input protection
  • 40-pin plastic dual-in-line package (DIP) or 44-pin quad flat pack (QFP)
  • Specific features of the MC68HC908GP20 in 40-pin DIP are:
    • Port C is only 5 bits: PTC0&endash;PTC4
    • Port D is only 6 bits: PTD0&endash;PTD5; single 2-channel TIM module 1.3.2 Features of the CPU08

Features of the CPU08 include:

  • Enhanced HC05 programming model
  • Extensive loop control functions
  • 16 addressing modes (eight more than the HC05)
  • 16-bit index register and stack pointer
  • Memory-to-memory data transfers
  • Fast 8 X 8 multiply instruction
  • Fast 16/8 divide instruction
  • Binary-coded decimal (BCD) instructions
  • Optimization for controller applications
  • Efficient C language support

 

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68HC908GP20 Parametrics

RAM
(Bytes)
Flash
(KBytes)
Timer
I/O
Serial
A/D
PWM
Operating Voltage
(V)
Bus Frequency
(Max)
(MHz)
512
20
Dual 2-CH 16-Bit IC, OC, or PWM
33
SCI SPI
8-CH 8-Bit
See Timer
3.0, 5.0
8.0

 

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68HC908GP20 Documentation
Document ID Document Title
CPU08RM/AD CPU08RM Reference Manual
TIM08RM/AD TIM08 Reference Manual
MC68HC908GP20/D 68HC908GP20 Users Manual
68HC08APPNOTES List of 68HC08 Application Notes

 

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68HC908GP20 Design Tools and Data
ID Name
ICS0508 ICS0508 Development System
M68MMPFB0508 MMEVS Modular Evaluation System
M68MMDS0508 MMDS0508 Emulator System

 

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68HC908GP20 Orderable Parts
Orderable Part ID Package Info Status Remarks
MC68HC908GP20CP Plastic Dual In-Line Package (DIP) -40 to +85 C
MC68HC908GP20CFB Plastic Quad Flat Pack (QFP) -40 to +85 C

 

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