H8SSLASH2214 datasheet(616/936 Pages) RENESAS

616 / 936 page

Section 15 ROM

Rev.4.00 Sep. 18, 2008 Page 556 of 872

REJ09B0189-0400

15.7

15.7.1

Flash Memory Control Register 1 (FLMCR1)

Bit:

FWE

SWE1

ESU1

PSU1

EV1

PV1

Initial value:

—*

R/W:

R/W

Note: * Determined by the state of the FWE pin.

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

or erase-verify mode for addresses H'00000 to H'1FFFF is entered by setting SWE1 bit to 1 when

FWE = 1, then setting the PV1 or EV1 bit. Program mode for addresses H'00000 to H'1FFFF 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'1FFFF 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 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

H8S/2214 Scheda tecnica(PDF) 616 Page - Renesas Technology Corp