HD64F2638F20J Datasheet, PDF (843/1512 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 21A ROM
(H8S/2636 Group)
φ
V_CC
FWE
t_OSC1
t_MDS
Min. 0μs
t_MDS^*2
MD2 to MD0
RES
t_MDS
t_RESW
SWE bit
SWE set
SWE
cleared
Mode
change^*1
Boot
mode
Mode User User program 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, t_MDS (min.), of 200 ns
is necessary with respect to the RES clearance timing.
3. See section 24.1.7, Flash Memory Characteristics.
Figure 21A-20 Mode Transition Timing
(Example: Boot Mode → User Mode ↔ User Program Mode)
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 793 of 1458