SH7014 datasheet(532/754 Pages) RENESAS

532 / 754 page

18. 128 kB Flash Memory (F-ZTAT)

Rev.5.00 Sep. 27, 2007 Page 498 of 716

REJ09B0398-0500

18.5

18.5.1

Flash Memory Control Register 1 (FLMCR1)

Bit:

FWE

SWE

ESU

PSU

Initial value:

1/0

R/W:

R/W

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

or erase-verify mode is entered by setting SWE to 1 when FWE = 1. Program mode is entered by

setting SWE to 1 when FWE = 1, then setting the PSU bit, and finally setting the P bit. Erase

mode is entered by setting SWE to 1 when FWE = 1, then setting the ESU bit, and finally setting

the E bit. FLMCR1 is initialized by a 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 to bits SWE, ESU, PSU, EV, and PV are enabled only when FWE = 1 and SWE = 1; writes

to the E bit only when FWE = 1, SWE = 1, and ESU = 1; and writes to the P bit only when FWE =

1, SWE = 1, and PSU = 1.

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 FWP pin (hardware-protected state)

(Initial value)

When a high level is input to the FWP pin

SH7014 Datasheet(PDF) 532 Page - Renesas Technology Corp