MC68HC908GR8 Datasheet, PDF (20/286 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

General Description
• 7680 bytes of on-chip FLASH memory on the MC68HC908GR8 and 4096 bytes of on-chip FLASH
memory on the MC68HC908GR4 with in-circuit programming capabilities of FLASH program
memory
• 384 bytes of on-chip random-access memory (RAM)
• Serial peripheral interface module (SPI)
• Serial communications interface module (SCI)
• One 16-bit, 2-channel timer (TIM1) and one 16-bit, 1-channel timer (TIM2) interface modules with
selectable input capture, output compare, and PWM capability on each channel
• 6-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 21 general-purpose input/output (I/O) pins, including:
– 19 shared-function I/O pins
– Up to two 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–PTC1
• 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 or disabled during stop mode
• 4-bit keyboard wakeup port
• 42-pin shrink dual in-line package (SDIP), 32-pin quad flat pack (QFP), 28-pin plastic dual-in-line
package (DIP), or 28-pin small outline integrated circuit (SOIC)
• Specific features of the MC68HC908GR8 in 28-pin DIP and 28-pin SOIC are:
– Port B is only 4 bits: PTB0–PTB3; 4-channel ADC module
– No Port C bits
1.2.2 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 × 8 multiply instruction
• Fast 16/8 divide instruction
• Binary-coded decimal (BCD) instructions
• Optimization for controller applications
• Efficient C language support
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
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Freescale Semiconductor