HD6432142 datasheet(688/1177 Pages) RENESAS

Part #	HD6432142

Description	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1177 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 22 ROM (Mask ROM Version, H8S/2148 F-ZTAT, H8S/2147N F-ZTAT, H8S/2144 F-ZTAT, and H8S/2142 F-ZTAT)

Rev. 4.00 Sep 27, 2006 page 644 of 1130

REJ09B0327-0400

22.4.3

Flash Memory Operating Modes

Mode Transitions

When the mode pins are set in the reset state and a reset-start is executed, the MCU enters one of

the operating modes shown in figure 22.3. In user mode, flash memory can be read but not

programmed or erased.

Flash memory can be programmed and erased in boot mode, user program mode, and programmer

mode.

Boot mode

On-board programming mode

User

program mode

User mode with

on-chip ROM

enabled

Reset state

Programmer

mode

RES = 0

SWE = 1

SWE = 0

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

not accessing the flash memory.

1. MD0 = MD1 = 0, P92 = 0, P91 = P90 = 1

2. MD0 = MD1 = 0, P92 = P91 = P90 = 1

RES = 0

MD1 = 1

Figure 22.3 Flash Memory Mode Transitions

HD6432142 Datasheet(PDF) 688 Page - Renesas Technology Corp