Reset Status Register RSR | Freescale Semiconductor MC68HC08KH12

;This code works if the H register has been pushed onto the stack in the break

;service routine software. This code should be executed at the end of the

;break service routine software.

HIBYTE EQU 5

LOBYTE EQU 6

;If not SBSW, do RTI

	BRCLR	SBSW,BSR, RETURN	; See if wait mode or stop mode was exited
			; by break
	TST	LOBYTE,SP	; If RETURNLO is not zero,
	BNE	DOLO	; then just decrement	low byte.
	DEC	HIBYTE,SP	; Else deal with high	byte, too.
DOLO	DEC	LOBYTE,SP	; Point to WAIT/STOP opcode.
RETURN	PULH		; Restore H register.
	RTI

7.8.2 Reset Status Register (RSR)

This register contains six flags that show the source of the last reset. Clear the SIM reset status register by reading it. A power-on reset sets the POR bit and clears all other bits in the register.

Address:

Read:

Write:

POR:

$FE01
Bit 7	6	5	4	3	2	1	Bit 0

POR	PIN	COP	ILOP	ILAD	USB	0	0


1	0	0	0	0	0	0	0
	= Unimplemented
	= Unimplemented

Figure 7-21. Reset Status Register (RSR)

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

84	Freescale Semiconductor

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.

Freescale Semiconductor MC68HC08KH12 manual Reset Status Register RSR

Models: MC68HC08KH12

Figure 7-21. Reset Status Register (RSR)

MC68HC08KH12 specifications