H8SSLASH2214 datasheet(608/936 Pages) RENESAS

Il numero della parte	H8S/2214

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

PDF	936 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

Homepage	http://www.renesas.com

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Section 15 ROM

Rev.4.00 Sep. 18, 2008 Page 548 of 872

REJ09B0189-0400

15.4.3

Mode Transitions

When the mode pins and the FWE pin are set in the reset state and a reset-start is executed, the

microcomputer enters an operating mode as shown in figure 15.3. Transitions between user mode

and user program mode should only be made when the CPU is not accessing the flash memory.

The boot, user program and programmer modes are provided as modes to write and erase the flash

memory.

Boot mode

On-board programming mode

User

program mode

User mode

(on-chip ROM

enabled)

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. MD0 = 0, MD1 = 0, MD2 = 0, P14 = 0, P16 = 0, PF0 = 1, PE3 = 1

RES = 0

MD1 = 1,

MD2 = 0,

FWE = 1

RES = 0

MD1 = 1,

MD2 = 1,

FWE = 0

MD1 = 1,

MD2 = 1,

FWE = 1

Figure 15.3 Flash Memory State Transitions

H8S/2214 Scheda tecnica(PDF) 608 Page - Renesas Technology Corp