tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 318

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

21. Flash Memory
RA003
21.1 Flash Memory Control
Flash memory control register 1
Flash memory control register 2
(0x0FD0)
(0x0FD1)
FLSCR1
FLSCR2
Note 1:
Note 2:
Note 3:
(FLSCR2), and flash memory standby control register (FLSSTB).
The flash memory is controlled by the flash memory control register 1 (FLSCR1), flash memory control register 2
Note 1: If "0xD5" is set on FLSCR2<CR1EN> with FLSCR1<FLSMD> set to "101", the flash memory goes into an active state,
It is prohibited to make a setting in "Reserved".
The flash memory control register 1 has a double-buffer structure comprised of the register FLSCR1 and a shift register.
Writing "0xD5" to the register FLSCR2 allows a register setting to be reflected and take effect in the shift register. This
means that a register setting value does not take effect until "0xD5" is written to the register FLSCR2. The value of the shift
register can be checked by reading the register FLSCRM.
FLSMD must be set to either "0y010" or "0y101".
and MCU consumes the same amount of current as it does during a read.
Read/Write
FLSMD
BAREA
Read/Write
CR1EN
Bit Symbol
FAREA
Bit Symbol
After reset
After reset
Flash memory command
sequence and toggle control
BOOTROM mapping control
Flash memory area select control
FLSCR1 register
enable/disable control
7
0
7
*
FLSMD
R/W
6
1
6
*
5
0
5
Others
Others:
*
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0xD5
010:
101:
00:
01:
10:
11:
0:
1:
Enable a change in the FLSCR1 setting
Reserved
Disable command sequence and toggle execution
Enable command sequence and toggle execution
Reserved
Hide BOOTROM
Show BOOTROM
Assign the data area 0x8000 through 0xFFFF
Reserved
Assign the code area 0x8000 through 0xFFFF
Reserved
BAREA
to the data area 0x8000 through 0xFFFF (standard mapping).
to the data area 0x8000 through 0xFFFF.
R/W
4
0
4
*
CR1EN
MCU mode
W
3
0
3
*
FAREA
R/W
2
0
2
*
-
Show BOOTROM
Serial PROM mode
R/W
1
0
1
*
-
TMP89FM42
R/W
0
0
0
-
*