Fujitsu 8FX Hardware Manual page 595

MB95630H Series
[bit4] CERTO: CERTO interrupt request flag bit
This bit indicates that Flash memory chip erase has failed.
When Flash memory chip erase fails, the CERTO bit is set to "1" upon completion of the Flash memory
automatic algorithm.
An interrupt request is generated when the CERTO bit is set to "1", provided that generating an interrupt
request upon failure of Flash memory chip erase has been enabled (FSR4:CTIEN = 1).
When the CERTO bit is set to "1" after Flash memory chip erase is completed, further Flash memory
programming/erasing is disabled. Writing a reset command can make the Flash memory return to the normal
command state.
Writing "0" to this bit clears it.
Writing "1" to this bit has no effect on operation.
When read by the read-modify-write (RMW) type of instruction, this bit always returns "1".
bit4
Reading "0"
Reading "1"
Writing "0"
Writing "1"
[bit3:0] Undefined bits
Their read values are always "0". Writing values to these bits has no effect on operation.
MN702-00009-2v0-E
Indicates that the device is in the command input wait state or Flash memory chip erase is in
progress.
Indicates that Flash memory chip erase has failed.
Clears this bit.
Has no effect on operation.
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER 26 DUAL OPERATION FLASH MEMORY
Details
26.8 Registers
573