Method For Starting The Flash Memory's Automatic Algorithm - Fujitsu MB90480 Series Hardware Manual

F2mc-16lx 16-bit microcontroller

Table of Contents

CHAPTER 23 2M/3M BIT FLASH MEMORY

23.4 Method for Starting the Flash Memory's Automatic

There are four kinds of commands for starting the automatic algorithm for flash

memory: read/reset, write, chip erase, and sector erase. For sector erase operations,

control of suspension and resuming is provided.

Command sequence table

Table 23.4-1 lists the commands used for flash memory write/erase operations. Although the

data for writing to the command register is indicated in units of bytes, use word access during

actual operations. The contents of the upper byte are ignored in this case.

Table 23.4-1 Command sequence table

1st bus write

Write program

Sector erase

Sector erase suspend

Sector erase resume

RA: Read address

PA: Write address. Only even addresses can be specified.

SA: Sector address (Refer to Section "

RD: Read data

PD: Write data; only words can be specified

* : Both read and reset commands allow the flash memory to be reset to read mode.

• The address Fx in the table represents FF, FE, FD or FC. Specify the actual value corresponding

to the bank to be accessed in each operation.

• The address in the table indicates the value in the CPU memory map. Addresses and data are

indicated in hexadecimal representation; "X" indicates an arbitrary value.

2nd bus write

Entering data (xxB0H) at address "FxXXXX" will suspend a erasure in sector erase mode.

Entering data (xx30H) at address "FxXXXX" will resume erasure in sector erase suspend mode.

23.2 Sector Configuration of 2M/3M Bit Flash Memory

3rd bus write

4th bus write

5th bus write

6th bus write