HD6433644R datasheet(160/549 Pages) RENESAS

160 / 549 page

Section 6 ROM

Rev. 6.00 Sep 12, 2006 page 140 of 526

REJ09B0326-0600

Sample Program for Erasing Multiple Blocks

This program uses the following registers:

R0:

Used for erase block specification (set as explained below). Also stores address used in

prewrite and erase-verify.

R1H: Used to test bits 8 to 11 of R0. Stores read data; used in dummy write.

R1L: Used to test bits 0 to 11 of R0.

R2:

Specifies address where address used in prewrite and erase-verify is stored.

R3:

Stores address used in prewrite and erase-verify.

R4:

Stores last address of block to be erased.

R5:

Used for prewrite and erase loop counter value setting.

R6L: Used for prewrite-verify and erase-verify fail count.

Arbitrary blocks can be erased by setting bits in R0. R0 settings should be made by writing with a

word transfer instruction.

A bit map of R0 and a sample setting for erasing specific blocks are shown below.

Bit:



 LB3 LB2 LB1 LB0 SB7 SB6 SB5 SB4 SB3 SB2 SB1 SB0

Corresponds to EBR1

Corresponds to EBR2

Note: Bits 15 to 12 should be cleared to 0.

Example: To erase blocks LB2, SB7, and SB0

Bit:



 LB3 LB2 LB1 LB0 SB7 SB6 SB5 SB4 SB3 SB2 SB1 SB0

Corresponds to EBR1

Corresponds to EBR2

R0 is set as follows:

MOV.W

#H'0481, R0

MOV.B

R0H,

@EBR1

MOV.B

R0L,

@EBR2

The values of #a, #b, #c, #d, and #e in the program depend on the operating frequency. They

should be set as indicated in tables 6.11 and 6.12.

HD6433644R Datasheet(PDF) 160 Page - Renesas Technology Corp

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