Input/Output (I/O) Ports (PORTS)

Addr.

Register Name

 

Data Direction Register B

$0005

(DDRB)

 

See page 105.

 

Data Direction Register C

$0006

(DDRC)

 

See page 106.

$0007

 

 

Port E Data Register

$0008

(PTE)

 

See page 108.

 

Port F Data Register

$0009

(PTF)

 

See page 110.

$000A

Unimplemented

$000B

Unimplemented

 

Data Direction Register E

$000C

(DDRE)

 

See page 109.

 

Data Direction Register F

$000D

(DDRF)

 

See page 110.

 

Bit 7

6

 

5

4

3

2

1

Bit 0

Read:

DDRB7

DDRB6

 

DDRB5

DDRB4

DDRB3

DDRB2

DDRB1

DDRB0

Write:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

0

0

 

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

Read:

0

DDRC6

 

DDRC5

DDRC4

DDRC3

DDRC2

DDRC1

DDRC0

 

 

 

Write:

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

0

0

 

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unimplemented

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read:

PTE7

PTE6

 

PTE5

PTE4

PTE3

PTE2

PTE1

PTE0

Write:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

 

 

 

 

Unaffected by reset

 

 

 

 

 

 

 

 

 

 

 

 

 

Read:

0

0

 

PTF5

PTF4

PTF3

PTF2

PTF1

PTF0

 

 

 

 

Write:

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

 

 

 

 

Unaffected by reset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read:

DDRE7

DDRE6

 

DDRE5

DDRE4

DDRE3

DDRE2

DDRE1

DDRE0

Write:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

0

0

 

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

Read:

0

0

 

DDRF5

DDRF4

DDRF3

DDRF2

DDRF1

DDRF0

 

 

 

 

Write:

R

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset:

 

 

 

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

 

R

= Reserved

 

 

= Unimplemented

 

 

 

 

 

 

 

 

 

 

 

 

Figure 10-1. I/O Port Register Summary (Continued)

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

102

Freescale Semiconductor

Page 101 Page 103
Page 102
Image 102
Freescale Semiconductor MC68HC908MR32, MC68HC908MR16 manual Input/Output I/O Ports Ports Addr Register Name, Bit
Page 101 Page 103

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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