MC68HC908GR4CDW

SOP28
The MC68HC908GR8 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.

• High-performance M68HC08 architecture optimized for Ccompilers
• 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)

• 4096 bytes of on-chip FLASH memory 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 incircuit
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
• 32-pin quad flat pack (QFP) or 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