HD6432142 datasheet(703/1177 Pages) RENESAS

703 / 1177 page

Section 22 ROM (Mask ROM Version, H8S/2148 F-ZTAT, H8S/2147N F-ZTAT, H8S/2144 F-ZTAT, and H8S/2142 F-ZTAT)

Rev. 4.00 Sep 27, 2006 page 659 of 1130

REJ09B0327-0400

On-Chip RAM Area Divisions in Boot Mode

In boot mode, the 128-byte area from H'(FF)FF00 to H'(FF)FF7F is reserved for use by the boot

program, as shown in figure 22.10. The area to which the programming control program is

transferred is H'(FF)E080 to H'(FF)EFFF (3968 bytes) in the 128-kbyte versions, or H'(FF)E880 to

H'(FF)EFFF (1920 bytes) in the 64-kbyte versions. The boot program area can be used when the

programming control program transferred into RAM enters the execution state. A stack area

should be set up as required.

H'(FF)E080

H'(FF)EFFF

Programming

control program

area

(3,968 bytes)

H'(FF)FF00

H'(FF)FF7F

Boot program

area*

(128 bytes)

(a) 128-kbyte versions

H'(FF)E880

H'(FF)EFFF

Programming

control program

area

(1,920 bytes)

H'(FF)FF00

H'(FF)FF7F

Boot program

area*

(128 bytes)

(b) 64-kbyte versions

Note: * The boot program area cannot be used until a transition is made to the execution state

for the programming control program transferred to RAM. Note that the boot program

remains stored in this area after a branch is made to the programming control program.

Figure 22.10 RAM Areas in Boot Mode

Notes on Use of User Mode

• When the chip comes out of reset in boot mode, it measures the low period of the input at the

SCI’s RxD1 pin. The reset should end with RxD1 high. After the reset ends, it takes about 100

states for the chip to get ready to measure the low period of the RxD1 input.

• In boot mode, if any data has been programmed into the flash memory (if all data is not 1), all

flash memory blocks are erased. Boot mode is for use when user program mode is unavailable,

such as the first time on-board programming is performed, or if the program activated in user

program mode is accidentally erased.

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