Datasheet

Section 17 Flash Memory (F-ZTAT Version)
Rev.7.00 Dec. 24, 2008 Page 591 of 698
REJ09B0074-0700
V
CC
FWE
t
OSC1
min 0μs
t
MDS
t
MDS
t
MDS
t
RESW
MD2 to MD0
RES
SWE1 bit
Mode
change
*
1
Boot
mode
Mode
change*
1
User
mode
User program mode User
mode
User program
mode
SWE1 set
SWE1
cleared
x
*
4
*
4
*
2
*
4
*
4
1.
2.
3.
4.
When entering boot mode or making a transition from boot mode to another mode, mode switching must be
carried out by means of RES input
When making a transition from boot mode to another mode, a mode programming setup time t
MDS
(min) of 200
ns is necessary with respect to RES clearance timing.
See section 22.7, Flash Memory Characteristics.
Wait time:
θ .
Period during which flash memory access is prohibited
(x: Wait time after setting SWE1 bit)*
3
Period during which flash memory can be programmed
(Execution of program in flash memory prohibited, and data reads other than verify operations prohibited)
Notes:
Wait time: Programming/ erasing possible
x
Wait time: Programming/ erasing possible
x
Wait time: Programming/ erasing possible
x
Wait time: Programming/ erasing possible
φ
Figure 17.18 Mode Transition Timing
(Example: Boot Mode → User Mode ↔ User Program Mode)