Table 12-2. Port A Pin Functions

 

 

 

Accesses

Accesses to PTA

DDRA

PTA Bit

I/O Pin

to DDRA

 

 

Bit

Mode

 

 

 

 

Read/Write

Read

Write

 

 

 

 

 

 

 

 

 

0

X(1)

Input, Hi-Z(2)

DDRA[7:0]

Pin

PTA[7:0](3)

1

X

Output

DDRA[7:0]

PTA[7:0]

PTA[7:0]

 

 

 

 

 

 

1.X = don’t care

2.Hi-Z = high impedance

3.Writing affects data register, but does not affect input.

12.4 Port B

Port B is an 8-bit general-purpose bidirectional I/O port with software configurable pullups.

12.4.1 Port B Data Register (PTB)

The port B data register contains a data latch for each of the eight port B pins.

Address:

Read:

Write:

Reset:

$0001

 

 

 

 

 

 

 

Bit 7

6

5

4

3

2

1

Bit 0

 

 

 

 

 

 

 

 

PTB7

PTB6

PTB5

PTB4

PTB3

PTB2

PTB1

PTB0

 

 

 

 

 

 

 

 

Unaffected by reset

Figure 12-4. Port B Data Register (PTB)

PTB[7:0] — Port B Data Bits

These read/write bits are software-programmable. Data direction of each port B pin is under the control of the corresponding bit in data direction register B. Reset has no effect on port B data.

 

The port B pullup enable bit, PBP, in the port option control register

 

(POC) enables pullups on port B pins if the respective pin is configured

 

as an input. (See 12.9 Port Options.).

Advance Information

MC68HC(7)08KH12 — Rev. 1.1

 

 

 

 

188

Freescale Semiconductor

Page 187 Page 189
Page 188
Image 188
Freescale Semiconductor MC68HC08KH12 manual Port B, Port a Pin Functions, 188
Page 187 Page 189

MC68HC08KH12 specifications

The Freescale Semiconductor MC68HC08KH12 is a versatile microcontroller that has gained popularity in various embedded systems applications. Part of the HC08 family, this microcontroller combines a robust architecture with comprehensive on-chip features, making it suitable for a wide range of applications ranging from industrial control to consumer electronics.

One of the main features of the MC68HC08KH12 is its 8-bit architecture, which provides an optimal balance between performance and power efficiency. It operates at clock speeds of up to 2 MHz, allowing for efficient execution of instructions while maintaining low power consumption. The microcontroller is designed to operate over a voltage range of 2.7 to 5.5 volts, making it adaptable to various system requirements.

The MC68HC08KH12 is equipped with 1 Kbyte of RAM and 12 Kbytes of ROM, which allows for substantial program and data storage. The on-chip memory helps reduce the need for external components, simplifying the design of embedded systems and enhancing reliability. With a wide range of I/O options, including 26 general-purpose I/O pins, the microcontroller provides flexibility in interfacing with sensors, actuators, and other devices.

In terms of technologies, the MC68HC08KH12 features an advanced instruction set that enhances programming efficiency. It supports basic arithmetic operations, bit manipulation, and control transfer instructions, making it suitable for a variety of computational tasks. The integrated timers, analog-to-digital converters, and serial communication interfaces, including UART, provide the necessary tools for real-time control and data exchange with peripheral devices.

Another characteristic of the MC68HC08KH12 is its low power mode capabilities, which allow it to enter a sleep state during periods of inactivity. This feature is essential in battery-powered applications, where minimizing power consumption is crucial for extending operational life.

Overall, the Freescale Semiconductor MC68HC08KH12 stands out as a reliable microcontroller that combines performance, flexibility, and power efficiency. Its extensive features and technologies enable engineers to design robust embedded systems that meet the demands of modern applications. As a result, the MC68HC08KH12 remains a valuable choice for developers seeking a highly functional yet cost-effective microcontroller solution.
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