TMP86FS49AIUG datasheet(240/296 Pages) TOSHIBA

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19. Flash Memory

19.1 Flash Memory Control

TMP86FS49AIUG

19.1 Flash Memory Control

The flash memory is controlled via the flash memory control register (FLSCR) .

Note 1: The command sequence of the flash memory can be executed only when FLSMD="0011B". In other cases, any attempts

to execute the command sequence are ineffective.

Note 2: FLSMD must be set to either "1100B" or "0011B".

Note 3: BANKSEL is effective only in the serial PROM mode. In the MCU mode, the flash memory is always accessed with actual

addresses (1000-FFFFH) regardless of BANKSEL.

Note 4: Bits 2 through 0 in FLSCR are always read as don’t care.

19.1.1 Flash Memory Command Sequence Execution Control (FLSCR<FLSMD>)

The flash memory can be protected from inadvertent write due to program error or microcontroller misoper-

ation. This write protection feature is realized by disabling flash memory command sequence execution via the

flash memory control register (write protect). To enable command sequence execution, set FLSCR<FLSMD>

to “0011B”. To disable command sequence execution, set FLSCR<FLSMD> to “1100B”. After reset,

FLSCR<FLSMD> is initialized to “1100B” to disable command sequence execution. Normally,

FLSCR<FLSMD> should be set to “1100B” except when the flash memory needs to be written or erased.

19.1.2 Flash Memory Bank Select Control (FLSCR<BANKSEL>)

In the serial PROM mode, a 2-kbyte BOOTROM is mapped to addresses 7800H-7FFFH and the flash mem-

ory is mapped to 2 banks at 8000H-FFFFH. Flash memory addresses 1000H-7FFFH are mapped to 9000H-

FFFFH as BANK0, and flash memory addresses 8000H-FFFFH are mapped to 8000H-FFFFH as BANK1.

FLSCR<BANKSEL> is used to switch between these banks. For example, to access the flash memory address

7000H, set FLSCR<BANKSEL> to “0” and then access F000H. To access the flash memory address 9000H,

set FLSCR<BANKSEL> to “1" and then access 9000H.

In the MCU mode, the flash memory is accessed with actual addresses at 1000H-FFFFH. In this case,

FLSCR<BANKSEL> is ineffective (i.e., its value has no effect on other operations).

Flash Memory Control Register

FLSCR

654

(0FFFH)

FLSMD

BANKSEL

(Initial value : 1100 1***)

FLSMD

Flash memory command sequence exe-

cution control

1100: Disable command sequence execution

0011: Enable command sequence execution

Others: Reserved

R/W

BANKSEL

Flash memory bank select control

(Serial PROM mode only)

0: Select BANK0

1: Select BANK1

R/W

Table 19-1 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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