SPI Module Block Diagram | Freescale Semiconductor MC68HC908MR16

Functional Description

15.4 Functional Description

Figure 15-2shows the structure of the SPI module and Figure 15-3shows the locations and contents of the SPI I/O registers.

The SPI module allows full-duplex, synchronous, serial communication between the microcontroller unit (MCU) and peripheral devices, including other MCUs. Software can poll the SPI status flags or SPI operation can be interrupt-driven. All SPI interrupts can be serviced by the CPU.

INTERNAL BUS

CGMOUT ⎟ 2 (FROM SIM)

		⎟ 2
CLOCK		⎟ 8
CLOCK
DIVIDER	⎟ 32
	⎟ 32
	⎟ 128



SPMSTR	SPE

		TRANSMIT DATA REGISTER
			SHIFT REGISTER
	7	6	5	4	3	2	1	0
		RECEIVE DATA REGISTER
CLOCK
SELECT								CLOCK
								CLOCK
								LOGIC
SPR1	SPR0
						SPMSTR		CPHA	CPOL

CONTROL

LOGIC

MISO

MOSI

SPSCK

TRANSMITTER CPU INTERRUPT REQUEST

RECEIVER/ERROR CPU INTERRUPT REQUEST

SPI

CONTROL

MODFEN

ERRIE

SPTIE

SPRIE

SPE

SPRF

SPTE

OVRF

MODF

SPWOM

Figure 15-2. SPI Module Block Diagram

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor

197

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 SPI Module Block Diagram

Models: MC68HC908MR16 MC68HC908MR32