TMP86FS28DFG datasheet(223/272 Pages) TOSHIBA

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TMP86FS28DFG

17.1.3 Flash Memory Standby Control (FLSSTB<FSTB>)

Low power consumption is enabled by cutting off the steady-state current of the flash memory. In the

IDLE0/1/2, SLEEP0/1/2 or STOP mode, the steady-state current of the flash memory is cut off automatically.

When the program is executed in the RAM area (without accessing the flash memory) in the NORMAL 1/2

or SLOW1/2 mode, the current can be cut off by the control of the register. To cut off the steady-state current of

the flash memory, set FLSSTB<FSTB> to “1” by the control program in the RAM area. The procedures for

controlling the FLSSTB register are explained below.

(Steps1 and 2 are controlled by the program in the flash memory, and steps 3 through 8 are controlled by the

write control program executed in the RAM area.)

1. Transfer the control program of the FLSSTB register to the RAM area.

2. Jump to the RAM area.

3. Disable (DI) the interrupt master enable flag (IMF = “0”).

4. Set FLSSTB<FSTB> to “1”.

5. Execute the user program.

6. Repeat step 5 until the return request to the flash memory is detected.

7. Set FLSSTB<FSTB> to “0”.

8. Jump to the flash memory area.

Note 1: The standby function is not operated by setting FLSSTB<FSTB> with the program in the flash memory. You

must set FLSSTB<FSTB> by the program in the RAM area.

Note 2: To use the standby function by setting FLSSTB<FSTB> to “1” with the program in the RAM area,

FLSSTB<FSTB> must be set to “0” by the program in the RAM area before returning the program control to

the flash memory. If the program control is returned to the flash memory with FLSSTB<FSTB> set to “1”,

the program may misoperate and run out of control.

Table 17-1 Flash Memory Access

Operating Mode

FLSCR

Access Area

Specified Address

MCU mode

Don’t care

1000H-FFFFH

Serial PROM mode

(BANK0)

1000H-7FFFH

9000H-FFFFH

(BANK1)

8000H-FFFFH

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