M38045FFHKP datasheet(80/116 Pages) RENESAS

80 / 116 page

Rev.1.01

Jan 25, 2005

page 80 of 114

REJ03B0131-0101Z

3804 Group (Spec. H)

Fig. 77 Block diagram of built-in flash memory

q Boot Mode

The control program for CPU rewrite mode must be written into

the User ROM or Boot ROM area in parallel I/O mode beforehand.

(If the control program is written into the Boot ROM area, the stan-

dard serial I/O mode becomes unusable.)

See Figure 77 for details about the Boot ROM area.

Normal microcomputer mode is entered when the microcomputer

is reset with pulling CNVSS pin low. In this case, the CPU starts

operating using the control program in the User ROM area.

When the microcomputer is reset and the CNVSS pin high after

pulling the P45/TxD1 pin and CNVss pin high, the CPU starts op-

erating (start address of program is stored into addresses FFFC16

and FFFD16) using the control program in the Boot ROM area.

This mode is called the “Boot mode”. Also, User ROM area can be

rewritten using the control program in the Boot ROM area.

q Block Address

Block addresses refer to the maximum address of each block.

These addresses are used in the block erase command.

q CPU Rewrite Mode

In CPU rewrite mode, the internal flash memory can be operated

on (read, program, or erase) under control of the Central Process-

ing Unit (CPU).

In CPU rewrite mode, only the User ROM area shown in Figure 77

can be rewritten; the Boot ROM area cannot be rewritten. Make

sure the program and block erase commands are issued for only

the User ROM area and each block area.

The control program for CPU rewrite mode can be stored in either

User ROM or Boot ROM area. In the CPU rewrite mode, because

the flash memory cannot be read from the CPU, the rewrite con-

trol program must be transferred to internal RAM area before it

can be executed.

SFR area

Internal RAM area

(2K bytes)

000016

004016

083F16

SFR area

Internal flash memory area

(60K bytes)

0FE016

RAM

FFFF16

0FFF16

100016

User ROM area

Data block B:

2K bytes

100016

180016

E00016

C00016

FFFF16

F00016

FFFF16

Boot ROM area

4K bytes

Notes 1: The boot ROM area can be rewritten in a paral-

lel I/O mode. (Access to except boot ROM

area is disablrd.)

2: To specify a block, use the maximum address

in the block.

Block 3: 24K bytes

200016

800016

Data block A:

2K bytes

Block 2: 16K bytes

Block 1: 8 K bytes

Block 0: 8 K bytes

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