HD64F2149YV datasheet(726/1075 Pages) RENESAS

726 / 1075 page

Section 22 ROM

Rev. 3.00 Jan 18, 2006 page 698 of 1044

REJ09B0280-0300

Writes to the EV and PV bits in FLMCR1 are enabled only when SWE=1; writes to the E bit only

when SWE = 1, and ESU = 1; and writes to the P bit only when SWE = 1, and PSU = 1.

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

programming/erasing. This bit cannot be modified and is always read as 1.

Bit 6—Software Write Enable (SWE): Enables or disables flash memory programming. SWE

should be set before setting bits ESU, PSU, EV, PV, E, P, and EB7 to EB0, and should not be

cleared at the same time as these bits.

Bit 6

SWE

Description

Writes disabled

(Initial value)

Writes enabled

Bit 5 and 4—Reserved: These bits cannot be modified and are always read as 0.

Bit 3—Erase-Verify (EV): Selects erase-verify mode transition or clearing. Do not set the SWE,

ESU, PSU, PV, E, or P bit at the same time.

Bit 3

Description

Erase-verify mode cleared

(Initial value)

Transition to erase-verify mode

[Setting condition]

When SWE = 1

Bit 2—Program-Verify (PV): Selects program-verify mode transition or clearing. Do not set the

SWE, ESU, PSU, EV, E, or P bit at the same time.

Bit 2

Description

Program-verify mode cleared

(Initial value)

Transition to program-verify mode

[Setting condition]

When SWE = 1

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