Status Register - Renesas R8C/18 Series Hardware Manual

R8C/18 Group, R8C/19 Group
17.4.4

Status Register

The status register indicates the operating status of the flash memory and whether an erase or
program operation has completed normally or in error. Status of the status register can be read by bits
FMR00, FMR06, and FMR07 in the FMR0 register.
Table 17.5 lists the Status Register Bits.
In EW0 mode, the status register can be read in the following cases:
•
When a given address in the user ROM area is read after writing the read status register
command
•
When a given address in the user ROM area is read after executing the program or block erase
command but before executing the read array command.
17.4.4.1 Sequencer Status (Bits SR7 and FMR00)
The sequencer status bits indicate the operating status of the flash memory. SR7 is set to 0 (busy)
during/auto-programming and auto-erasure, and is set to 1 (ready) at the same time the operation
completes.
17.4.4.2 Erase Status (Bits SR5 and FMR07)
Refer to 17.4.5 Full Status Check.
17.4.4.3 Program Status (Bits SR4 and FMR06)
Refer to 17.4.5 Full Status Check.
Table 17.5 Status Register Bits
Status Register Bit FMR0 Register Bit
SR0 (D0)
SR1 (D1)
SR2 (D2)
SR3 (D3)
SR4 (D4)
SR5 (D5)
SR6 (D6)
SR7 (D7)
• D0 to D7: Indicate the data bus which is read when the read status register command is executed.
• Bits FMR07 (SR5) to FMR06 (SR4) are set to 0 by executing the clear status register command.
• When the FMR07 bit (SR5) or FMR06 bit (SR4) is set to 1, the program and block erase commands
cannot be accepted.
Rev.1.30 Apr 14, 2006
REJ09B0222-0130
Status Name
−
Reserved
−
Reserved
−
Reserved
−
Reserved
FMR06 Program status Completed
FMR07 Erase status
−
Reserved
FMR00 Sequencer
status
Page 192 of 233
Description
0 1
− −
− −
− −
− −
Error
normally
Completed Error
normally
− −
Busy Ready
17. Flash Memory Version
Value after
Reset
−
−
−
−
0
0
−
1