7.6.1.2 SWI Instruction

The SWI instruction is a non-maskable instruction that causes an interrupt regardless of the state of the interrupt mask (I bit) in the condition code register.

NOTE: A software interrupt pushes PC onto the stack. A software interrupt does not push PC – 1, as a hardware interrupt does.

7.6.2 Interrupt Status Registers

The flags in the interrupt status registers identify maskable interrupt sources. Table 7-3summarizes the interrupt sources and the interrupt status register flags that they set. The interrupt status registers can be useful for debugging.

Table 7-3. Interrupt Sources

 

 

 

 

 

Mask(1)

INT

Priority(2)

 

 

 

 

Source

Flag

Register

Vector Address

 

 

 

 

 

 

Flag

 

 

 

 

 

 

 

 

 

 

 

 

SWI Instruction

 

 

—

0

$FFFC–$FFFD

 

 

 

 

 

 

 

 

 

 

 

 

Pin

IRQF1

IMASK1

IF1

1

$FFFA–$FFFB

 

 

IRQ1

 

 

 

 

 

 

 

 

 

 

HUB Start of Frame Interrupt

SOFF

SOFIE

 

 

 

 

 

 

 

 

 

 

 

 

 

HUB 2nd End of Frame Point Interrupt

EOF2F

EOF2IE

IF2

2

$FFF8–$FFF9

 

 

 

 

 

 

 

 

HUB End of Packet Interrupt

EOPF

EOPIE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HUB Bus Signal Transition Detect Interrupt

TRANF

TRANIE

 

 

 

 

 

 

 

 

 

 

 

 

 

HUB Endpoint0 Transmit Interrupt

TXDF

TXDIE

IF3

3

$FFF6–$FFF7

 

 

 

 

 

 

 

 

HUB Endpoint0 Receive Interrupt

RXDF

RXDIE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Device Endpoint 0 Transmit Interrupt

TXD0F

TXD0IE

 

 

 

 

 

 

 

 

 

 

 

 

 

Device Endpoint 0 Receive Interrupt

RXD0F

RXD0IE

IF4

4

$FFF4–$FFF5

 

 

 

 

 

 

 

 

 

 

USB Endpoint1/2 Transmit Interrupt

TXD1F

TXD1IE

 

 

 

 

 

 

 

 

 

 

 

 

 

TIM Channel 0

CH0F

CH0IE

IF5

5

$FFF2–$FFF3

 

 

 

 

 

 

 

 

 

 

TIM Channel 1

CH1F

CH1IE

IF6

6

$FFF0–$FFF1

 

 

 

 

 

 

 

 

 

 

TIM Overflow

TOF

TOIE

IF7

7

$FFEE–$FFEF

 

 

 

 

 

 

 

 

 

 

Port-E Keyboard Pin Interrupt

KEYEF

IMASKE

IF8

8

$FFEC–$FFED

 

 

 

 

 

 

 

Advance Information

 

 

 

MC68HC(7)08KH12 — Rev. 1.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

76

 

 

 

 

Freescale Semiconductor

Page 75 Page 77
Page 76
Image 76
Freescale Semiconductor MC68HC08KH12 manual SWI Instruction, Interrupt Sources
Page 75 Page 77

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.
Top Page Image Contents