h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 659

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

23.2
When the mode pins are set in the reset state and a reset-start is executed, this LSI enters an
operating mode as shown in figure 23.2. In user mode, flash memory can be read but not
programmed or erased. The boot, user program, and programmer modes are provided as modes to
write and erase the flash memory.
The differences between boot mode and user program mode are shown in table 23.1. Figure 23.3
shows the boot mode and figure 23.4 shows the user program mode.
Table 23.1 Differences between Boot Mode and User Program Mode
Note:
Total erase
Block erase
Programming control program *
FLSHE = 1
SWE = 1
(on-chip ROM
User mode
* Should be provided by the user, in accordance with the recommended algorithm.
enabled)
Mode Transitions
On-board programming mode
FLSHE = 0
SWE = 0
program
mode
User
Figure 23.2 Flash Memory State Transitions
Reset state
Boot Mode
Yes
No
Program/program-verify
Boot mode
*
1
*
2
RES
Notes: Only make a transition between user mode
Programmer
=
Rev. 3.00 Mar 21, 2006 page 605 of 788
0
mode
and user program mode when the CPU is not
accessing the flash memory.
1. MD1 = MD0 = 0, P92 = P91 = P90 = 1
2. MD1 = MD0 = 0, P92 = 0, P91 = P90 = 1
User Program Mode
Yes
Yes
Program/program-verify
Erase/erase-verify
REJ09B0300-0300
Section 23 ROM