SH7041A datasheet(728/923 Pages) RENESAS

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22.5

Description of Registers

22.5.1

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 for addresses H'00000–H'1FFFF is entered by setting SWE to 1 when FWE

= 1, then setting the EV1 or PV1 bit. Program mode for addresses H'00000–H'1FFFF is entered by

setting SWE to 1 when FWE = 1, then setting the PSU1 bit, and finally setting the P1 bit. Erase

mode for addresses H'00000–H'1FFFF is entered by setting SWE to 1 when FWE = 1, then setting

the ESU1 bit, and finally setting the E1 bit. FLMCR1 is initialized in the standby mode or with

power-on reset. Its initial value is H'80 when a low level is input to the FWP pin, and H'00 when a

high level is input. When on-chip flash memory is disabled, a read will return H'80, and writes are

invalid.

Writes to bits SWE, ESU1, PSU1, EV1, and PV1 are enabled only when FWE = 1 and SWE = 1;

writes to the E1 bit only when FWE = 1, SWE = 1, and ESU1 = 1; and writes to the P1 bit only

when FWE = 1, SWE = 1, and PSU1 = 1.

Bit:

FWE

SWE

ESU1

PSU1

EV1

PV1

Initial value:

R/W:

R/W

• Bit 7—Flash Write Enable Bit (FWE): Displays the state of the FWP pin which sets hardware

protection against flash memory programming/erasing.

Bit 7: FWE

Description

When high level is input to the FWP pin (hardware-protect state)

When low level is input to the FWP pin

• Bit 6—Software Write Enable Bit (SWE): Enables or disables the flash memory. This bit

should be set when setting bits 5–0, FLMCR2 bits 5–0, EBR1 bits 3–0, and EBR2 bits 7–0.

Bit 6: SWE

Description

Writes disabled

(Initial value)

Writes enabled

[Setting condition] When FWE=1

• Bit 5—Erase Setup Bit 1 (ESU1): Prepares for a transition to erase mode (applicable

addresses: H'00000–H'1FFFF). Do not set the SWE, PSU1, EV1, PV1, E1, or P1 bit at the

same time.

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