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Fujitsu MB89202 Overview of Flash Memory, Writing to/Erasing Flash Memory, Flash Memory Register

Models: F202RA MB89202

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CHAPTER 17 FLASH MEMORY

17.1Overview of Flash Memory

The 128K-bit flash memory is mapped to the C000H to FFFFH bank in the CPU memory map. The functions of the flash memory interface circuit enable read-access and program-access from the CPU in the same way as mask ROM. Instructions from the CPU can be used via the flash memory interface circuit to write data to and erase data from the flash memory. Internal CPU control therefore enables rewriting of the flash memory while it is mounted. As a result, improvements in programs and data can be performed efficiently.

■Flash Memory Features

•16 Kbyte ⋅ 8-bit configuration

•Use of automatic program algorithm (Embedded Algorthm)

•Detection of completion of writing/erasing using data polling or toggle bit functions

•Detection of completion of writing/erasing using CPU interrupts

•Compatible with JEDEC standard commands

•Minimum of 10000 write / erase operations (MB89F202/F202RA)

■High voltage supply on RST pin (applicable to MB89F202RA only)

During writing data to or erasing all data in flash memory, a typical +10V D.C. voltage should be applied at the RST pin. After applying the high voltage, wait for 10ms before writing data or erasing all data in flash memory. And this applied voltage should be kept at the RST pin until data writing or erasing has been completed.

■Writing to/Erasing Flash Memory

The flash memory cannot be written to and read at the same time. That is, when data is written to or erased data from the flash memory, the program in the flash memory must first be copied to RAM. The entire process is then executed in RAM so that data is simply written to the flash memory. This eliminates the need for the program to access the flash memory from the flash memory itself.

■Flash Memory Register

Compatible with JEDEC standard commands

Bit No.

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

 

 

 

 

 

 

 

 

 

0079H

INTE

RDYINT

WE

RDY

-

-

-

-

 

 

 

 

 

 

 

 

 

Read/write

(R/W)

(R/W)

(R/W)

(R)

(-)

(-)

(-)

(-)

 

 

 

 

 

 

 

 

 

Initial value

(0)

(0)

(0)

(X)

(-)

(-)

(-)

(-)

 

 

 

 

 

 

 

 

 

358

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Page 374
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Fujitsu MB89202, F202RA manual Overview of Flash Memory, Writing to/Erasing Flash Memory, Flash Memory Register
Page 373 Page 375

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.