H8SSLASH2224 datasheet(803/1071 Pages) RENESAS

Il numero della parte	H8S/2224

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	1071 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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Section 20 Flash Memory (F-ZTAT Version)

Rev. 5.00 Aug 08, 2006 page 717 of 982

REJ09B0054-0500

The differences between boot mode and user program mode are shown in table 20.1.

Figure 20.3 shows the operation flow for boot mode and figure 20.4 shows that for user program

mode.

Boot mode

On-board programming mode

User

program mode

User mode

Reset state

Programmer

mode

RES = 0

FWE = 1

FWE = 0

Notes: Only make a transition between user mode and user program mode when the CPU is

not accessing the flash memory.

1. RAM emulation possible

2. In the H8S/2258, H8S/2239, H8S/2238B, and H8S/2238R, MD0 = 0, MD1 = 0, MD2 = 0,

P14 = 0, P16 = 0, PF0 = 1.

3. In the H8S/2227 Group, MD0 = 0, MD1 = 0, MD2 = 0, P14 = 0, P16 = 0, PF0 = 1, PF3 = 1.

RES = 0

MD1 = 1,

MD2 = 0,

FWE = 1

RES = 0

MD1 = 1,

MD2 = 1,

FWE = 0*

MD1 = 1,

MD2 = 1,

FWE = 1

Figure 20.2 Flash Memory State Transitions

Table 20.1 Differences between Boot Mode and User Program Mode

Boot Mode

User Program Mode

Total erase

Yes

Block erase

Yes

Programming control program*

Program/program-verify

Program/program-verify/erase/

erase-verify/emulation

Note:

* To be provided by the user, in accordance with the recommended algorithm.

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