Monitor Mode Circuit | Freescale Semiconductor MC68HC908MR16

Monitor ROM (MON)

10 ∝F

DB-25 2

MC145407

19		+
19

10 ∝F

10 ∝F VDD

MC74HC125

			VDD	MC68HC908MR16/
			10 kΩ	MC68HC908MR16/
			10 kΩ	MC68HC908MR32
			S1	RST
				RST
			0.1 ∝F
			VHI
			10 kΩ
		VDDA		IRQ
		VDDA
				VDDA
		0.1 ∝F	VDDAD
			VDDAD
				VDDAD
			0.1 ∝F
		VREFH
				VREFH
		0.1 ∝F		CGMXFC
				CGMXFC
			0.02 ∝F
				OSC1
20 pF		X1	10 MΩ
20 pF		4.9152 MHz	10 MΩ
		4.9152 MHz
				OSC2
VDD		20 pF		VREFL
14				VSSAD
				VSSA
3				PWMGND
3				VSS
				VSS
5			VDD	VDD
				VDD
			0.1 ∝F
	VDD		VDD
			VDD
		10 kΩ	10 kΩ
	A	S3		PTA0
	B	S3		PTA7
	B			PTA7
		VDD	VDD	PTC2
		VDD

		10 kΩ	10 kΩ

S2 Position A — Bus clock = CGMXCLK ⎟ 4 or CGMVCLK ⎟ 4 S2 Position B — Bus clock = CGMXCLK ⎟ 2

S3 Position A — Parallel communication

S3 Position B — Serial communication

PTC3

PTC4

Figure 18-8. Monitor Mode Circuit

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

257

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.

Freescale Semiconductor MC68HC908MR16, MC68HC908MR32 manual Monitor Mode Circuit

Models: MC68HC908MR16 MC68HC908MR32

Monitor ROM (MON)

MC74HC125

Figure 18-8. Monitor Mode Circuit

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

MC68HC908MR16, MC68HC908MR32 specifications