HD64F2149 Datasheet, PDF (706/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Bit 3—Flash Memory Control Register Enable (FLSHE): Setting the FLSHE bit to 1 enables
read/write access to the flash memory control registers. If FLSHE is cleared to 0, the flash
memory control registers are deselected. In this case, the flash memory control register contents
are retained.
Bit 3
FLSHE
0
1
Description
Flash memory control registers deselected
Flash memory control registers selected
(Initial value)
Bit 2—Reserved: Do not write 1 to this bit.
Bits 1 and 0—Internal Clock Select 1 and 0 (ICKS1, ICKS0): These bits control 8-bit timer
operation. See section 12, 8-Bit Timers, for details.
22.6 On-Board Programming Modes
When pins are set to on-board programming mode, program/erase/verify operations can be
performed on the on-chip flash memory. There are two on-board programming modes: boot mode
and user program mode. The pin settings for transition to each of these modes are shown in table
22.7. For a diagram of the transitions to the various flash memory modes, see figure 22.3.
Only advanced mode setting is possible for boot mode.
In the case of user program mode, established in advanced mode or normal mode, depending on
the setting of the MD0 pin. In normal mode, only programming of a 56-kbyte area of flash
memory is possible.
Table 22.7 Setting On-Board Programming Modes
Mode
Mode Name
CPU Operating Mode
MD1 MD0 P92 P91 P90
Boot mode
Advanced mode
0
0
1*
1*
1*
User program mode
Advanced mode
1
0
—
—
—
Normal mode
1
—
—
—
Note: * Can be used as I/O ports after boot mode is initiated.
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