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General Description
MC68HC908GT16 MC68HC908GT8 Data Sheet, Rev. 3
20
Freescale Semiconductor
Master reset pin and power-on reset (POR)
16 Kbytes of on-chip 100k cycle write/erase capable FLASH memory (8 Kbytes on
MC68HC908GT8)
512 bytes of on-chip random-access memory (RAM)
720 bytes of FLASH programming routines ROM
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 pulse-width modulation (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
Up to 36 general-purpose input/output (I/O) pins, including:
–
28 shared-function I/O pins
–
Six or eight 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 20-mA sink/source capability on PTC0–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 or internal oscillator
User selection of having the oscillator enabled or disabled during stop mode
8-bit keyboard wakeup port
Available packages:
–
42-pin shrink dual in-line package (SDIP)
–
44-pin quad flat pack (QFP)
Specific features of the MC68HC908GT16 in 42-pin SDIP are:
–
Port C is only 5 bits: PTC0–PTC4
–
Port D is 8 bits: PTD0–PTD7; dual 2-channel TIM modules
Specific features of the MC68HC908GT16 in 44-pin QFP are:
–
Port C is 7 bits: PTC0–PTC6
Port D is 8 bits: PTD0–PTD7; dual 2-channel TIM modules
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