Fujitsu MB90335 Series Hardware Manual page 513

CHAPTER 22 DUAL OPERATION FLASH MEMORY
22.4 How to Start Automatic Algorithm of Flash Memory
■ Notes on Command Issuance
Pay attention to the following points when issuing commands in the command sequence table:
• Write-enable each required sector before issuing the first command.
• The upper address "U" bits (bit15 to bit12) used when commands are issued must have the same value
as RA, PA, and SA, from the first command on.
If these instructions are not followed, commands are not recognized normally, requiring that the command
sequencer in the flash memory be initialized by a reset.
492 FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
CM44-10137-6E