HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 878

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 19 ROM
Rev.6.00 Sep. 27, 2007 Page 848 of 1268
REJ09B0220-0600
φ
V
FWE
MD2 to MD0
RES
SWE bit
Notes: 1. When entering boot mode or making a transition from boot mode to another mode, mode switching must be
CC
Period during which flash memory access is prohibited
(x: Wait time after setting SWE bit)
Period during which flash memory can be programmed
(Execution of program in flash memory prohibited, and data reads other than verify operations prohibited)
2. When making a transition from boot mode to another mode, a mode programming setup time t
3. See section 22.2.6, Flash Memory Characteristics.
carried out by means of RES input. The state of ports with multiplexed address functions and bus control
output pins (AS, RD, WR) will change during this switchover interval (the interval during which the RES pin
input is low), and therefore these pins should not be used as output signals during this time.
ns is necessary with respect to RES clearance timing.
(Example: Boot Mode → User Mode ↔ User Program Mode)
t
OSC1
Mode
change
SWE
set
t
MDS
t
MDS
*1
Figure 19.58 Mode Transition Timing
Boot
mode
*3
SWE
cleared
Mode
change
t
RESW
Min 0 μs
t
MDS
*1
*2
User
mode
User program mode
User
mode
User program
mode
MDS
(min) of 200