H8SXSLASH1663M datasheet(1155/1504 Pages) RENESAS

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Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1123 of 1468

REJ09B0412-0200

(5)

Flash MAT Select Register (FMATS)

FMATS selects the user MAT or user boot MAT. Writing to FMATS should be done when a

program in the on-chip RAM is being executed.

MS7

0/1*

R/W

MS6

R/W

MS5

0/1*

R/W

MS4

R/W

MS3

0/1*

R/W

MS0

R/W

MS2

R/W

MS1

0/1*

R/W

Bit

Bit Name

Initial Value

R/W

Note: * This bit is set to 1 in user boot mode, otherwise cleared to 0.

Bit

Bit Name

Initial

Value

R/W

Description

MS7

MS6

MS5

MS4

MS3

MS2

MS1

MS0

0/1*

R/W

MAT Select

The memory MATs can be switched by writing a value

to FMATS.

When H'AA is written to FMATS, the user boot MAT is

selected. When a value other than H'AA is written, the

user MAT is selected. Switch the MATs following the

memory MAT switching procedure in section 25.11,

Switching between User MAT and User Boot MAT. The

user boot MAT cannot be selected by FMATS in user

programming mode. The user boot MAT can be

selected in boot mode or programmer mode.

H'AA: The user boot MAT is selected. (The user MAT is

selected when FMATS is a value other than

H'AA.)

(Initial value when initiated in user boot mode.)

H'00: The user MAT is selected.

(Initial value when initiated in a mode except for

user boot mode.)

Note:

This bit is set to 1 in user boot mode, otherwise cleared to 0.

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