7516 datasheet(50/90 Pages) RENESAS

50 / 90 page

Rev.1.01

Jul 01, 2003

page 50 of 89

7516 Group

Fig. 57 Block diagram of built-in flash memory

(1) 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 57

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 to be

executed before it can be executed.

Microcomputer Mode and 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 57 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 by pulling the P41/INT0 pin high,

the CNVss pin high, the CPU starts operating using the control

program in the Boot ROM area (program start address is FFFC16,

FFFD16 fixation). This mode is called the “Boot” mode.

Block Address

Block addresses refer to the maximum address of each block.

These addresses are used in the block erase command. In case

of the M37516F8, it has only one block.

800016

Block 1 : 32 kbyte

User ROM area

4 kbyte

F00016

FFFF16

Boot ROM area

Notes 1: The Boot ROM area can be rewritten in only parallel

input/output mode. (Access to any other areas is inhibited.)

2: To specify a block, use the maximum address in the block.

Product name

Flash memory

start address

M37516F8800016

Parallel I/O mode

800016

Block 1 : 32 kbyte

FFFF16

CPU rewrite mode, standard serial I/O mode

User ROM area

4 kbyte

F00016

FFFF16

Boot ROM area

BSEL = 0BSEL = 1

User area / Boot area selection bit = 0

User area / Boot area selection bit = 1

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