HD6432138SW datasheet(150/1061 Pages) RENESAS

Part #	HD6432138SW

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

PDF	1061 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

Logo

150 / 1061 page

Section 4 Exception Handling

Rev. 4.00 Jun 06, 2006 page 96 of 1004

REJ09B0301-0400

Address bus

Vector fetch

Internal

processing

Fetch of

first program

instruction

(1) (3) Reset exception vector address ((1) = H'0000, (3) = H'0001)

(2) (4) Start address (contents of reset exception vector address)

(5)

Start address ((5) = (2) (4))

(6)

First program instruction

RES

(1)

(5)

High

(2)

(4)

(3)

(6)

D7 to D0

Note: * 3 program wait states are inserted.

Figure 4.3 Reset Sequence (Mode 1)

4.2.3

Interrupts after Reset

If an interrupt is accepted after a reset but before the stack pointer (SP) is initialized, the PC and

CCR will not be saved correctly, leading to a program crash. To prevent this, all interrupt requests,

including NMI, are disabled immediately after a reset. Since the first instruction of a program is

always executed immediately after the reset state ends, make sure that this instruction initializes

the stack pointer (example: MOV.L #xx:32, SP).

HD6432138SW Datasheet(PDF) 150 Page - Renesas Technology Corp