RL78/I1D
Operation state switching IAR
R01AN3597EJ0100 Rev.1.00
Page 31 of 42
Jan. 31, 2017
4.7.15.
Flash operation mode switching (LS low consumption) processing
Figure 4.17 shows the flowchart of the flash operation mode switching (LS low consumption) processing.
switch_flashmode_to_LS_1
return
Middle-speed on-chip oscillator
operating
MIOEN bit
0 : Middle-speed on-chip oscillator operating
Set the regulator mode to
the normal setting
PMMC register
MCSEL bit
0
g_flash_mode
_02_FLAHMODE_LS_1
MCS1 = 0?
Yes
No
Main on-chip oscillator clock status in the case of
high-speed on-chip oscillator clock, switch to
the middle-speed on-chip oscillator clock.
Set the middle-speed on-chip
oscillator clock to
the main on-chip oscillator clock
MCM1 bit
1 : Select middle-speed on-chip oscillator clock
MCS1 = 1?
Yes
No
Set the high-speed on-chip oscillator
to stop
HIOSTOP bit
1 : High-speed on-chip oscillator stop
Set flash operation mode to
LS (low-speed main) mode
FLMWEN bit
1 :Rewriting the FLMODE register is enabled
FLMODE register
80H : LS (low-speed main) mode
FLMWEN bit
0 : Rewriting the FLMODE register is disabled
Updated status flag variable of
flash operation mode
Wait until the status of the main on-chip oscillator clock is
switched to the middle-speed on-chip oscillator clock
FLMODE = 40H?
Set the middle-speed on-chip
oscillator clock frequency to 1MHz
MOCODIV register
02H
Yes
No
Set the middle-speed on-chip
oscillator clock frequency to 4MHz
MOCODIV register
00H
Set the regulator mode to
the low-power consumption setting
PMMC register
MCSEL bit
1
Figure 4.17
Flash operation mode switching (LS low consumption) processing
