HD64F2357F20V Datasheet, PDF (648/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

Programming and
Wait time: x erase possible
Programming
and
erase Wait
Wait time: x possible time: x
Programming and
erase possible
Programming
and
Wait
erase
time: x possible
φ
VCC
FWE
tOSC1
t MDS
min 0µs
*²
t MDS
MD 2 to MD 0
t MDS
tRESW
RES
SWE bit
SWE set
SWE clear
Mode switching * ¹ Boot mode Mode
User
switching * ¹ mode
Flash memory access disabled period
(x: Wait time after SWE setting) * ³
User program mode
Flash memory reprogammable period
(Flash memory program execution and data read, other than verify, are disabled.)
User
mode
Notes: 1. In transition to the boot mode and transition from the boot mode to another mode,
mode switching via RES input is necessary.
During this switching period (period during which a low level is input to the RES pin),
the state of the address dual port and bus control output signals (AS,RD,WR) changes.
Therefore, do not use these pins as output signals during this switching period.
2. When making a transition from the boot mode to another mode, the mode programming
setup time tMDS (min)= 200 ns relative to the RES clear timing is necessary.
3. See section 22.7.6, Flash Memory Characteristics.
User
program
mode
Figure 19-35 Mode Transition Timing
(Example: Boot mode → User mode ↔ User program mode)
Rev.6.00 Oct.28.2004 page 618 of 1016
REJ09B0138-0600H