M37225M6_15 datasheet(87/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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87 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 85 of 124

REJ03B0136-0100Z

ADH,

ADL

01,S–2

01,S–1

PCH

PCL

PS

ADH

ADL

PC

?

: Undefined instruction decode

?

Undefined instruction decoding signal

occurs.Internal reset signal occurs.

φ

SYNC

Address

Data

Reset sequence

01,S

FFFE16

FFFF16

: Invalid

: Program counter

S

: Stack pointer

PC

ADL, ADH : Jump destination address of reset

Fig.8.11.1 Sequence at Detecting Software Runaway Detection

8.11 SOFTWARE RUNAWAY DETECT FUNCTION

This microcomputer has a function to decode undefined instructions

to detect a software runaway.

When an undefined op-code is input to the CPU as an instruction

code during operation, the following processing is done.

➀ The CPU generates an undefined instruction decoding signal.

➁ The device is internally reset because of occurrence of the unde-

fined instruction decoding signal.

➂ As a result of internal reset, the same reset processing as in the

case of ordinary reset operation is done, and the program restarts

from the reset vector.

Note, however, that the software runaway detecting function cannot

be invalid.

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