Datasheet

Section 22 Flash Memory
Page 1152 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
22.3 On-Board Programming Mode
When the mode pins (MD0, MD1, and MD2) are set to on-board programming mode and the reset
start is executed, a transition is made to on-board programming mode in which the on-chip flash
memory can be programmed/erased. On-board programming mode has three operating modes:
SCI boot mode by P27 and P26 settings, USB boot mode, and user programming mode.
Table 22.3 shows the pin setting for each operating mode.
Table 22.3 On-Board Programming Mode Setting
Mode Setting EMLE MD2 MD1 MD0 P27 P26
Input clock frequencies
for oscillators
SCI boot mode 0 1 1 0 0
0 1 1 0 1 16MHz
0 1 1 1 0 12 MHz
USB boot mode
0 1 1 1 1 8 MHz
User programming mode
0
Single-chip mode,
on-chip ROM
enabled expanded
mode
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