Location of 16-bit Data on Memory | Fujitsu MB89202, F202RA specification

CHAPTER 3 CPU

3.1.2Location of 16-bit Data on Memory

Upper digits of 16-bit data and stack data are stored in lower addresses on memory.

■16-bit Data Storage State on RAM

When 16-bit data is written into RAM, the upper byte of the data is stored with a lower address and the lower byte of the data is stored with the next address. 16-bit data is read in the same manner.

Figure 3.1-2shows the location of 16-bit data on RAM.

Figure 3.1-2 Location of 16-bit Data on RAM

Before written

A 1234H

Memory

			After
			written
	MOVW 0081H, A
	0080H
	0081H
	0081H		1234H
	A		1234H
	0082H
	0082H
	0083H

Memory

12H

34H

0080H

0081H

0082H

0083H

■16-bit Operand Storage State

When 16 bits are specified for operands in instructions, upper bytes are also stored in addresses close to operation codes (instructions) and lower bytes are stored in the following addresses.

Operands that indicate memory addresses and 16-bit immediate data are handled in the same manner as stated above.

Figure 3.1-3shows the locations of 16-bit data in instructions.

Figure 3.1-3 Location of 16-bit Data in Instructions

[Example] MOV A, 5678H				; Extend address
MOV W A, #1234H				; 16-bit immediate data
				Processed through assembler
	.
	.
	.
XXX0H	XX	XX		; Extend address
XXX2H	60	56	78	; Extend address
XXX5H	E4	12	34	; 16-bit immediate data
XXX8H	XX
	.
	.
	.

■16-bit Data Storage State in Stack

The upper byte of data for a 16-bit register put in the stack due to an interrupt is also stored with a lower

address.

F202RA, MB89202 specifications

The Fujitsu MB89202 and F202RA microcontrollers are part of the 16-bit microcontroller family, renowned for their robust performance and versatility in a variety of embedded system applications. These devices are tailored for high-efficiency operation across diverse industries, including automotive, consumer electronics, and industrial automation.

One of the main features of the MB89202 is its powerful CPU core, which operates at a clock speed of up to 20 MHz. This enables the microcontroller to perform complex calculations and consumer-grade applications seamlessly. The architecture is designed to handle multiple tasks effectively, making it suitable for real-time operations.

Memory capacity is a vital characteristic of the MB89202, featuring on-chip RAM and ROM configurations. The microcontroller can accommodate different memory variants, providing developers with flexibility in memory allocation based on their application requirements. This adaptability facilitates applications ranging from simple control systems to complex data processing tasks.

The F202RA variant extends the capabilities of the MB89202 by integrating advanced peripheral functions. It includes built-in timers, A/D converters, and serial communication interfaces, which are essential for interfacing with other hardware components or sensors. The availability of these peripherals reduces the need for additional external circuits, thus contributing to a more compact and cost-effective design.

In terms of power management, the MB89202 series employs advanced power-saving technologies. The microcontroller offers various low-power modes, enabling devices to conserve energy during idle times, making it highly suitable for battery-operated applications. This characteristic not only enhances the efficiency of devices but also extends their operational lifespan.

Moreover, the Fujitsu MB89202 series incorporates robust protection features, including watchdog timers and failure detection mechanisms. These safety features ensure reliable operation in critical systems, making them a preferred choice in applications where failure is not an option.

The MB89202 and F202RA microcontrollers also support a range of development tools and environments, including integrated development environments (IDEs) and software libraries, which facilitate rapid application development. With these tools, developers can efficiently prototype, debug, and optimize their applications.

In summary, the Fujitsu MB89202 and F202RA microcontrollers stand out with their efficient performance, extensive memory options, integrated peripherals, and power-saving capabilities, making them ideal for a wide array of embedded applications. Their reliability and robustness further enhance their attractiveness for designers seeking advanced microcontroller solutions.

Fujitsu MB89202, F202RA manual Location of 16-bit Data on Memory, Bit Operand Storage State

Models: F202RA MB89202