RX610 Group
3. Operating Modes
R01UH0032EJ0120 Rev.1.20
Page 96 of 1006
Feb 20, 2013
3.4.2
Operating Mode Transitions According to Register Setting
Figure 3.2 shows operating mode transitions according to the setting of the ROME and EXBE bits in SYSCR0.
Operating modes can shift in the direction of arrow.
Single-chip mode
User boot mode
EXBE = 0
EXBE = 1
EXBE = 0
EXBE = 1
Mode can shift
On-chip ROM disabled extended
mode
On-chip ROM: Disabled
External bus: Enabled
ROME = 0
EXBE =1
On-chip ROM: Disabled
External bus: Disabled
ROME = 0
EXBE = 0
On-chip ROM enabled extended
mode
On-chip ROM: Enabled
External bus: Enabled
ROME = 1
EXBE = 1
On-chip ROM: Enabled
*
External bus: Disabled
ROME = 1
EXBE = 0
ROME = 0
ROME = 0
EXBE = 0
ROME = 0
Note:
*
Initial state after reset
ROME = 0
EXBE = 1
Figure 3.2 Setting of Bits ROME and EXBE and Operating Modes