H8SSLASH2218 datasheet(620/750 Pages) RENESAS

620 / 750 page

Section 17 Flash Memory (F-ZTAT Version)

Rev.6.00 Jun. 03, 2008 Page 572 of 698

REJ09B0074-0600

• Overview

When a reset start preformed after the pins of this LSI have been set to boot mode, a boot

program incorporated in the microcomputer beforehand is activated, and the prepared

programming control program is transmitted sequentially to the host using the USB. With this

LSI, the programming control program received by the USB is written to a programming

control program area in on-chip RAM. After transfer is completed, control branches to the start

address of the programming control program area, and the programming control program

execution state is established (flash memory programming is performed). Figure 17.8 shows a

system configuration diagram when using USB boot mode.

Note: * FWE pin and mode pin input must satisfy the mode programming setup time (t

MDS = 200ns) when a reset is released.

Legend:

×: Don’t care

UBPM

VBUS

1: Self power setting

0: Bus power setting

Data transmission/reception

This LSI

Flash memory

P36

1.5k

Host or

self-powerd HUB

On-chip RAM

System clock:

16 MHz or 24MHz

FWE*

MD2 to MD0*

EMLE

EXTAL

XTAL

D+

D-

USD+

USD-

USB

Figure 17.8 System Configuration Diagram when Using USB Boot Mode

Table 17.7 shows operations from reset release in USB boot mode until processing branches to

the programming control program.

1. When boot mode is used, the flash memory programming control program must be prepared in

the host beforehand. Prepare a programming control program in accordance with the

description in section 17.8, Flash Memory Programming/Erasing. 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 in enforced exit when user program mode is unavailable, such a

the first time on-board programming control program, or performed, or if the program

activated in user program mode is accidentally erased.

2. When the boot program is activated, enumeration with respect to the host is carried out.

Enumeration information is shown in table 17.6. When enumeration is completed, transmit a

single H'55 byte from the host. If reception has not been preformed normally, restart boot mode

by means of a reset.

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