h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 636

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 21 ROM
21.4.3
Mode Transitions: When the mode pins are set in the reset state and a reset-start is executed, the
MCU enters one of the operating modes shown in figure 21.3. In user mode, flash memory can be
read but not programmed or erased.
Flash memory can be programmed and erased in boot mode, user program mode, and programmer
mode.
Rev. 4.00 Jun 06, 2006 page 582 of 1004
REJ09B0301-0400
SWE = 1
Notes: Only make a transition between user mode and user program mode when the CPU is
User mode with
on-chip ROM
Flash Memory Operating Modes
enabled
not accessing the flash memory.
1. MD1 = MD0 = 0, P92 = P91 = P90 = 1
2. MD1 = MD0 = 0, P92 = 0, P91 = P90 = 1
(Mask ROM Version, H8S/2138 F-ZTAT, H8S/2134 F-ZTAT, and H8S/2132 F-ZTAT)
On-board programming mode
program mode
SWE = 0
User
Figure 21.3 Flash Memory Mode Transitions
MD1 = 1
RES = 0
RES = 0
Reset state
Boot mode
*
1
RES = 0
*
2
RES = 0
Programmer
mode