HD64F2638F20J Datasheet, PDF (951/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Section 21C ROM
(H8S/2635 Group)
φ
VCC
FWE
MD2 to MD0
RES
t_OSC1
t_MDS
tMDS
Min. 0 μs
tMDS^*2
tRESW
SWE bit
SWE
set
SWE
cleared
Mode
Boot Mode User User program mode
change^*1 mode change^*1 mode
User User program
mode mode
Period during which flash memory access is prohibited
(x: Wait time after setting SWE 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: 1. 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. 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.
2. When making a transition from boot mode to another mode, a mode programming setup time tMDS (min.) of 200
ns is necessary with respect to RES clearance timing.
3. See section 24.2.7, 24.3.7, and 24.4.7, Flash Memory Characteristics.
Figure 21C-20 Mode Transition Timing
(Example: Boot Mode → User Mode ↔ User Program Mode)
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 901 of 1458