H8SXSLASH1663 datasheet(976/1158 Pages) RENESAS

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Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 924 of 1102

REJ09B0294-0100

21.8

Protection

There are three types of protection against the flash memory programming/erasing: hardware

protection, software protection, and error protection.

21.8.1

Hardware Protection

Programming and erasure of the flash memory is forcibly disabled or suspended by hardware

protection. In this state, download of an on-chip program and initialization are possible. However,

programming or erasure of the user MAT cannot be performed even if the programming/erasing

program is initiated, and the error in programming/erasing is indicated by the FPFR parameter.

Table 21.11 Hardware Protection

Function to be Protected

Item

Description

Download

Programming/

Erasing

Reset protection

• The programming/erasing interface

registers are initialized in the reset

state (including a reset by the WDT)

and the programming/erasing

protection state is entered.

• The reset state will not be entered by

a reset using the

RES pin unless the

RES pin is held low until oscillation has

settled after a power is initially

supplied. In the case of a reset during

operation, hold the

RES pin low for the

RES pulse width given in the AC

characteristics. If a reset is input during

programming or erasure, data in the

flash memory is not guaranteed. In this

case, execute erasure and then

execute programming again.

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