Mode Transition Diagram - Renesas H8S/2100 Series Hardware Manual

Section 24 Flash Memory
Mode pins
[Legend]
FCCS: Flash code control/status register
FPCS: Flash program code select register
FECS: Flash erase code select register
FKEY: Flash key code register
FMATS: Flash MAT select register
RAMER: Flash transfer destination address register
Note: To read/write the registers above, the FLSHE bit in the serial timer control register (STCR)
must be set to 1.
24.2

Mode Transition Diagram

When the mode pins are set in the reset state and reset start is performed, this LSI enters each
operating mode as shown in figure 24.2. Although the flash memory can be read in user mode, it
cannot be programmed or erased. The flash memory can be programmed or erased in boot mode,
user program mode, user boot mode, and programmer mode. The differences between boot mode,
user program mode, user boot mode, and programmer mode are shown in table 24.1.
Rev. 1.00 Apr. 28, 2008 Page 750 of 994
REJ09B0452-0100
Internal address bus
Internal data bus (16 bits)
FCCS
FPCS
FECS
Control unit
FKEY
FTDAR
FMATS
Operating
mode
Figure 24.1 Block Diagram of Flash Memory
Memory MAT unit
User MAT: 160 kbytes
User boot MAT: 8 kbytes
Flash memory