HC705V8GRSSLASHD datasheet(170/172 Pages) NXP

Part #	HC705V8GRS/D

Description	The Motorola MC68HC705V8 microcontroller is a custom HC05 based MCU featuring a Message Data Link Controller (MDLC) module and on-chip power regulation.

PDF	172 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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SECTION 18: 705V8 BEHAVIOR DURING EMULATION

Page 159

MC68HC705V8 Specification Rev. 2.1

SECTION 18

705V8 BEHAVIOR DURING EMULATION

This section covers the functions of the MCU that behave differently during emulation using

either the 705V8/05V7 EVS or MMDS emulation systems. Since the 705V8/05V7 device

itself is used in the emulator system and operates in TEST mode, some extra software

operations must be performed to make the device behave as it will in the users application

(USER mode). The circuits that require special treatment are described in the sections that

follow.

18.1

COP

A value of $04 should be written to location $003F to enable the COP circuitry. The COP

circuit is defaulted off to allow ease of factory testing. It should be noted that enabling the

COP with this bit will enable the COP regardless of the state of the COPEN bit in the MOR

18.2

MDLC

The MDLC requires bit 2 and 3 to be set in the MDLC Control Register ($0E) to allow normal

operation of the MDLC. If these two bits are not set during emulation the MDLC will not

transmit or receive.

18.3

REGULATOR

The voltage regulator should not be enabled in the device used in the top board of the

emulator system. This may result in a supply voltage contention and may overheat and

damage the emulator system.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705V8GRS/D Datasheet(PDF) 170 Page - NXP Semiconductors