Renesas R8C/20 User Manual

R8C/20 Group, R8C/21 Group 19. Flash Memory
Rev.2.00 Aug 27, 2008 Page 396 of 458
REJ09B0250-0200
Figure 19.15 Block Erase Command (When Erase-Suspend Function Enabled)
Start
Write the command code 20h
Write D0h to any block
address
FMR00 = 1 ?
Full status check
Block erase completed
No
Yes
EW0 Mode
FMR40 = 1
Start
Write the command code 20h
Write D0h to any block
address
FMR00 = 1 ?
Full status check
Block erase completed
No
Yes
EW1 Mode
I = 1 (enable interrupt)
Maskable interrupt
(2)
REIT
Access flash memory
FMR41 = 0
NOTES:
1.In EW0 mode, the interrupt vector table and interrupt routine for interrupts to be used should be allocated to the RAM area.
2. td(SR-SUS) is needed until the interrupt request is acknowledged after it is generated. The interrupt to enter suspend
should be in interrupt enabled status.
3.When no interrupt is used, the instruction to enable interrupts is not needed.
4. td(SR-SUS) is needed until erase is suspended after the FMR41 bit in the FMR4 register is set to 1.
Maskable interrupt
(1)
FMR46 = 1 ?
REIT
Yes
FMR41 = 1
(4)
FMR41 = 0
Access flash memory
FMR43 = 1 ?
Yes
No
Access flash memory
No
I = 1 (enable interrupt)
(3)
FMR40 = 1

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English