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Evaluation System for 80C166

(parts 1 and 2)

March & April 1999, 990028

gested solutions are (1) to use a 40-MHz

crystal oscillator module, (2) use a differ-

ent 40-MHz crystal or (3) adapt the value

of C18 and C19 until oscillation occurs at

the third overtone.

The battery may be a 3.6-V NiCd type, but

note that this is very slowly charged by the

MAX690. A better solution is to use a Lithi-

um battery.

The circuit diagram does not make it clear

how the serial connection is made via D9.

Pins 2 and 3 of this

connector

should not be

connected

TxD1 and

RxD1 (i.e.

the TTL

side of the

MAX232),

but to the

other

(RS232) side of

the MAX232. Pin 2

of D9 is therefore connected to pin 2BC via

bus K1. Likewise pin 3 of D9 is connected

to pin 3BC via bus K1. The correct con-

nections are shown in the illustration.

Errors in Components List

IC9 and IC10 should be type 74HC573, not

HCT573.

C1 and C2 should be 10µF 16 tantalum

bead.

R20 should be an 8-way SIL array, value

4k

Development System for

68HC11F1

June 1999, 990042

JP1 is a simple jumper. In the text and parts

list, it is erroneously referred to as K3.

Part K3 is a 4-way SIL pinheader. In the text

and parts list, it is erroneously referred to

as JP1

R4 is erroneously listed as a SIL array with

a value of 10k

10 µ

10 µ

5V6

. The PCB however only

accommodates eight discrete resistors.

These are numbered R4 and R6-R12.

Resistor R13 in the circuit diagram equals

R4 on the PCB.

11B

10A

10BC

14BC

15BC

D9

1

Miscellaneous

Pull-up resistors R1-R4 need not be mount-

ed with the serial channels.

When a 40-MHz crystal is used for X1, it

may oscillate at the fundamental frequen-

cy (13.333 MHz) instead of the third over-

tone. If this happens the system baudrate

will not be correct and the serial commu-

nication will fail to work as described. Sug-

6

2

2BC

7

3

3BC

8

PC-Controlled Model Railway:

EEDTS Pro

June 1999, 990082-2

On page 60, the text references t S3, D1 and

S4 should read S2, D2 and S1 respectively.

4

9

5

990028-11

12 - 10/99 Elektor Electronics EXTRA —————————————— PC T OPICS

CORRECTIONS

7.

The crystal frequency mentioned with C18,

C19 should be 40MHz, not 100MHz.

IC3, MAX690 should be listed as MAX690

(BATT), not MAX690 (I/O)

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