7516 datasheet(52/90 Pages) RENESAS

52 / 90 page

Rev.1.01

Jul 01, 2003

page 52 of 89

7516 Group

Fig. 59 CPU rewrite mode set/release flowchart

End

Start

Execute read array command or reset flash

memory by setting flash memory reset bit (by

writing “1” and then “0” in succession) (Note 3)

Single-chip mode or Boot mode (Note 1)

Set CPU mode register (Note 2)

Using software command execute erase,

program, or other operation

Jump to control program transferred in RAM

(Subsequent operations are executed by control

program in this RAM)

Transfer CPU rewrite mode control program

to RAM

Notes 1: When starting the MCU in the single-chip mode, supply 4.5 V to 5.5 V to the CNVss

pin until checking the CPU rewrite mode entry flag.

2: Set bits 6, 7 (main clock division ratio selection bits) at CPU mode register (003B16).

3: Before exiting the CPU rewrite mode after completing erase or program operation,

always be sure to execute the read array command or reset the flash memory.

Write “0” to CPU rewrite mode select bit

Set CPU rewrite mode select bit to “1” (by

writing “0” and then “1” in succession)

Check CPU rewrite mode entry flag

Setting

Released

7516 Datasheet(PDF) 52 Page - Renesas Technology Corp