Renesas R8C/20 User Manual

R8C/20 Group, R8C/21 Group 19. Flash Memory
Rev.2.00 Aug 27, 2008 Page 394 of 458
REJ09B0250-0200
Figure 19.13 Program Command (When Suspend Function Enabled)
Start
Write the command code 40h
to the write address
Write data to the write address
FMR44 = 0 ?
Full status check
Program completed
No
Yes
EW0 Mode
FMR40 = 1
Start
Write the command code 40h
Write data to the write address
FMR44 = 0 ?
Full status check
Program completed
No
Yes
EW1 Mode
FMR40 = 1
Maskable interrupt
(2)
REIT
Access flash memory
FMR42 = 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 program is suspended after the FMR42 bit in the FMR4 register is set to 1.
Maskable interrupt
(1)
FMR46 = 1 ?
REIT
Yes
FMR42 = 1
(4)
FMR42 = 0
Access flash memory
FMR44 = 1 ?
Yes
No
Access flash memory
No
I = 1 (enable interrupt)
I = 1 (enable interrupt)
(3)

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English