SH7052 datasheet(722/919 Pages) RENESAS

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20.5

20.5.1

Flash Memory Control Register 1 (FLMCR1)

FLMCR1 is an 8-bit register used for flash memory operating mode control. Program-verify mode

or erase-verify mode is entered by setting SWE1 bit to 1 when FWE = 1, then setting the EV1 or

PV1 bit. Program mode is entered by setting SWE1 bit to 1 when FWE = 1, then setting the PSU1

bit, and finally setting the P1 bit. Erase mode for addresses H'00000 to H'3FFFF is entered by

setting SWE1 bit to 1 when FWE = 1, then setting the ESU1 bit, and finally setting the E1 bit.

FLMCR1 is initialized by a power-on reset, and in hardware standby mode and software standby

mode. Its initial value is H'80 when a high level is input to the FWE pin, and H'00 when a low

level is input. When on-chip flash memory is disabled, a read will return H'00, and writes are

invalid.

Writes are enabled only in the following cases: Writes to bit SWE1 of FLMCR1 enabled when

FWE = 1, to bits ESU1, PSU1, EV1, and PV1 when FWE = 1 and SWE1 = 1, to bit E1 when

FWE = 1, SWE1 = 1 and ESU1 = 1, and to bit P1 when FWE = 1, SWE1 = 1, and PSU1 = 1.

Bit:

FWE

SWE1

ESU1

PSU1

EV1

PV1

Initial value:

1/0

R/W:

R/W

• Bit 7—Flash Write Enable Bit (FWE): Sets hardware protection against flash memory

programming/erasing.

Bit 7: FWE

Description

When a low level is input to the FWE pin (hardware-protected state)

When a high level is input to the FWE pin

• Bit 6—Software Write Enable Bit 1 (SWE1): Enables or disables flash memory programming

and erasing. Set this bit when setting bits 5 to 0, bits 7 to 0 of EBR1, and bits 3 to 0 of EBR2.

Bit 6: SWE1

Description

Writes disabled

(Initial value)

Writes enabled

[Setting condition]

When FWE = 1

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