Renesas H8S/2378F Bedienungsanleitung PDF herunterladen (Seite 37)

The results of comparing programming and erasing related functions on the boot mode, user program mode, and user

boot mode are shown in

Table 4-4.

Table 4-4 Comparison of Programming Modes

Function Boot Mode User Program Mode User Boot Mode

Programming/erasing

environment

On-board programming

Programming/erasing

enable area

User area

User boot area

User area User area

All erasure 9 (Automatic) 9 9

Erasure in block units 9*1 9 9

Program data transfer From the host computer via

the SCI

From a desired device via

RAM

From a desired device via

RAM

Reset start Embedded program storage

area

User area User boot area*2

Transition to the user

mode

Changing mode setting and

reset

Changing the FLSHE bit

setting

Changing mode setting

and reset

Notes:

1. All-erasure is performed. After that, the specified block can be erased.

2. Firstly, the reset vector is fetched from the embedded program storage area. After the flash memory related

registers are checked, the reset vector is fetched from the user boot area.

The user boot area can be programmed or erased only in the boot mode.

The user area and user boot area are entirely erased in the boot mode. Then, the user area or user boot area can be

programmed by commands. However, the contents of the area cannot be read until the all-erasure state. You can

program the user boot area in the boot mode then program the user area is programmed in the user boot mode, or

program only the user area by not entering the user boot mode.

In the user boot mode, the boot operation via a desired interface can be performed by the mode pin setting different

from that in the user program mode.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 77 78

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