Motorola MC68HC908GR8CDW

MC68HC908GR8CDW 일반적인 설명

The MC68HC908GR8CDW from NXP Semiconductors is a robust microcontroller unit (MCU) featuring an 8-bit HC08 core that can operate at a maximum frequency of 8 MHz. With 8 KB of flash memory for program storage and 256 bytes of RAM for data storage, this MCU provides ample space for application development. Moreover, it boasts a range of on-chip peripherals, including UART, SPI, and I2C for communication, as well as timers, analog-to-digital converters, and PWM modules, enhancing its versatility in various embedded system designs. The 16-pin SOIC packaging of the MC68HC908GR8CDW makes it suitable for space-constrained applications, while its wide operating voltage range of 2.7V to 5.5V ensures compatibility with a broad spectrum of projects

특징

For convenience, features have been organized to reflect:

Standard features of the MC68HC908GR8

Features of the CPU08

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)

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 PTC0PTC1

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: PTB0PTB3; 4-channel ADC module

No Port C bits

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 88 multiply instruction

Fast 16/8 divide instruction

Binary-coded decimal (BCD) instructions

Optimization for controller applications

Efficient C language support

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