258

Freescale Semiconductor

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Table 18-2. Monitor Mode Signal Requirements and Options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For Serial

 

 

 

 

 

 

RESET

$FFFE

PLL

PTC3

PTC4

PTC2

External

 

Bus

COP

Communication(2)

 

 

Comment

IRQ

CGMOUT

 

 

(S1)

/$FFFF

(S2)

Clock(1)

Frequency

PTA0

PTA7

Baud

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rate(3) (4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(S3)

 

 

 

 

X

GND

X

X

X

X

X

X

0

0

Disabled

X

X

0

No operation until reset goes high

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

 

 

 

 

 

4.9152

4.9152

2.4576

 

1

0

9600

 

PTC3 and PTC2 voltages only required if

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VTST

or

X

OFF

1

0

0

Disabled

 

 

 

 

IRQ = VTST; PTC2 determines frequency

 

 

 

 

MHz

MHz

MHz

X

1

DNA

 

 

 

 

VTST

 

 

 

 

 

 

 

divider

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

 

 

 

 

 

9.8304

4.9152

2.4576

 

1

0

9600

 

PTC3 and PTC2 voltages only required if

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VTST

or

X

OFF

1

0

1

Disabled

 

 

 

 

IRQ = VTST; PTC2 determines frequency

 

 

 

 

MHz

MHz

MHz

X

1

DNA

 

 

 

 

VTST

 

 

 

 

 

 

 

divider

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

VDD

$FFFF

OFF

X

X

X

9.8304

4.9152

2.4576

Disabled

1

0

9600

 

External frequency always divided by 4

 

 

 

 

Blank

MHz

MHz

MHz

X

1

DNA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

VTST

$FFFF

 

 

 

 

 

 

 

 

 

 

 

 

Enters user mode — will encounter an

 

or

OFF

X

X

X

X

—

—

Enabled

X

X

—

 

 

Blank

 

illegal address reset

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

VDD

Non-$FF

OFF

X

X

X

X

—

—

Enabled

X

X

—

 

Enters user mode

 

or

or

 

 

Programmed

 

GND

VTST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.External clock is derived by a 32.768 kHz crystal or a 4.9152/9.8304 MHz off-chip oscillator.

2.DNA = does not apply, X = don’t care

3.PAT0 = 1 if serial communication; PTA0 = X if parallel communication

4.PTA7 = 0 → serial, PTA7 = 1 → parallel communication for security code entry

Development Support

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Freescale Semiconductor MC68HC908MR32, MC68HC908MR16 manual Monitor Mode Signal Requirements and Options, $Ffff
Page 257 Page 259

MC68HC908MR16, MC68HC908MR32 specifications

Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are part of the popular HC08 family, designed primarily for embedded applications. These microcontrollers are particularly favored in automotive, industrial, and consumer product sectors due to their reliability and versatility.

One of the standout features of the MC68HC908MR series is its CMOS technology, which enhances performance while minimizing power consumption. This makes these microcontrollers suitable for battery-operated devices. They operate at a maximum clock frequency of 2 MHz and offer a 16-bit architecture, providing a solid balance between processing power and efficiency.

The MC68HC908MR32 variant is equipped with 32KB of flash memory, which allows for the storage of complex programs and extensive data handling. In contrast, the MC68HC908MR16 features 16KB of flash memory, making it ideal for simpler applications. Both microcontrollers also come with 1KB of RAM, enabling efficient data processing and real-time operations.

Another significant characteristic of these microcontrollers is their integrated peripherals. They come with multiple input/output (I/O) pins, which allow for connectivity with various sensors and actuators. The built-in timer systems offer precise timing control for automotive and industrial applications, while the Analog-to-Digital Converter (ADC) provides essential conversion capabilities for various analog signals.

For communication purposes, the MC68HC908MR series includes a serial communication interface, enabling easy integration with other devices and systems. This versatility facilitates the development of complex systems that require interaction with external components.

Security is another crucial aspect of these microcontrollers. They have built-in fail-safe mechanisms to ensure reliable operation under various conditions, making them suitable for critical systems. Additionally, their robust architecture helps to safeguard against potential disruptions or attacks.

In summary, Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are key players in the embedded systems landscape. Their blend of power efficiency, integrated features, and scalability ensures they remain relevant for a wide array of applications, making them a favored choice among engineers and developers looking for dependable solutions in a competitive market.
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