Port D Data Register PTD | Freescale Semiconductor MC68HC08KH12

12.6.1 Port D Data Register (PTD)

The port D data register contains a data latch for each of the eight port D

pins.

Address:

Read:

Write:

Reset:

Alternate Function:

$0003
Bit 7	6	5	4	3	2	1	Bit 0

PTD7	PTD6	PTD5	PTD4	PTD3	PTD2	PTD1	PTD0

			Unaffected by reset

KBD7	KBD6	KBD5	KBD4	KBD3	KBD2	KBD1	KBD0

Figure 12-10. Port D Data Register (PTD)

PTD[7:0] — Port D Data Bits

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

The port D pullups are automatically enabled if the respective pin is configured as a keyboard interrupt. (See 15.4.1 Port-D Keyboard Interrupt Functional Description.)

The port-D keyboard interrupt enable bits, KBDIE7—KBDIE0, in the port-D keyboard interrupt enable register (KBDIER), enable the port D pins as external interrupt pins. See Section 15. Keyboard Interrupt

Module (KBI).

12.6.2 Data Direction Register D (DDRD)

Data direction register D determines whether each port D pin is an input or an output. Writing a logic one to a DDRD bit enables the output buffer for the corresponding port D pin; a logic zero disables the output buffer.

MC68HC(7)08KH12 — Rev. 1.1	Advance Information

Freescale Semiconductor	193

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.

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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.

Freescale Semiconductor MC68HC08KH12 manual Port D Data Register PTD, 193

Models: MC68HC08KH12

$0003

Bit 7

Figure 12-10. Port D Data Register (PTD)

Module (KBI).

193

MC68HC08KH12 specifications