HD6433644R datasheet(173/549 Pages) RENESAS

Part #	HD6433644R

Description	8-Bit Single-Chip Microcomputer

PDF	549 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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173 / 549 page

Section 6 ROM

Rev. 6.00 Sep 12, 2006 page 153 of 526

REJ09B0326-0600

High-Speed, High-Reliability Programming: Unused areas of the flash memory in the

H8/3644F, H8/3643F, or H8/3642AF contain H'FF data (initial value). The flash memory uses a

high-speed, high-reliability programming procedure. This procedure provides higher programming

speed without subjecting the device to voltage stress and without sacrificing the reliability of the

programmed data.

Figure 6.18 shows the basic high-speed, high-reliability programming flowchart. Tables 6.15 and

6.16 list the electrical characteristics during programming.

Start

End

Error

Set VPP = 12.0 V ±0.6 V

Address = 0

n = 0

n + 1

→ n

Program setup command

Yes

Program command

Wait (25

µs)

Program-verify command

Wait (6

µs)

Address + 1

→ address

Set VPP = VCC

Verify?

n = 20?

Last address?

Figure 6.18 High-Speed, High-Reliability Programming

HD6433644R Datasheet(PDF) 173 Page - Renesas Technology Corp