mc68hc908gr8b Freescale Semiconductor, Inc, mc68hc908gr8b Datasheet - Page 18

• Manufacturer Part Number: mc68hc908gr8b
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.2.2 Features of the CPU08
Features of the CPU08 include:
1.3 MCU Block Diagram
Figure 1-1
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Serial peripheral interface (SPI) module
Serial communications interface (SCI) module
One 16-bit, 2-channel timer (TIM1) and one 16-bit, 1-channel timer (TIM2) interface modules with
selectable input capture, output compare, and pulse-width modulation (PWM) capability on each
channel
Up to 6-channel, 8-bit successive approximation analog-to-digital converter (ADC) depending on
package choice
BREAK (BRK) module to allow single breakpoint setting during in-circuit debugging
Internal pullups on IRQ and RST to reduce system cost
Up to 21 general-purpose input/output (I/O) pins
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/source capability on all port pins
Higher current 15-mA sink/source capability on PTC0–PTC1
Timebase module (TBM) 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 crystal
User selection of having the oscillator enabled or disabled during stop mode
4-bit keyboard wakeup port
Available packages:
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Specific features of the MC68HC908GR8B in 28-pin DIP and 28-pin SOIC are:
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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
Fast 16/8 divide instruction
Binary-coded decimal (BCD) instructions
Optimization for controller applications
Efficient C language support
32-pin low-profile quad flat pack (LQFP)
28-pin plastic dual in-line package (DIP)
28-pin small outline integrated circuit (SOIC)
Port B is only 4 bits: PTB0–PTB3; 4-channel ADC module
No port C bits
shows the structure of the MC68HC908GR8B.
8 multiply instruction
MC68HC908GR8B Data Sheet, Rev. 3.0
Freescale Semiconductor