h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 799

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

21A.4.3 Mode Transitions
When the mode pins and the FWE pin are set in the reset state and a reset-start is executed, the
microcomputer enters an operating mode as shown in figure 21A-3. 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.
Notes: Only make a transition between user mode and user program mode when the CPU is
FWE = 1
(on-chip ROM
User mode
enabled)
not accessing the flash memory.
1. RAM emulation possible
2. MD0 = 0, MD1 = 0, MD2 = 0, P14 = 0, P16 = 0, PF0 = 1
On-board programming mode
program mode
FWE = 0
* 1
User
Figure 21A-3 Flash Memory State Transitions
MD1 = 1,
MD2 = 1,
FWE = 0
MD1 = 1,
MD2 = 1,
FWE = 1
* 1
4-5
= 0
4-5
MD2 = 0,
MD1 = 1,
FWE = 1
= 0
Reset state
Boot mode
Rev. 6.00 Feb 22, 2005 page 739 of 1484
4-5
Section 21A ROM (H8S/2636 Group)
= 0
* 2
4-5
= 0
REJ09B0103-0600
Programmer
mode