Z86C34 datasheet(58/70 Pages) ZILOG

58 / 70 page

Z86C34/C35/C36/C44/C45/C46

CMOS Z8® MCUs with ASCI UART

ZiLOG

P R E L I M I N A R Y

DS007601-Z8X0499

MASK OPTIONS

Below is an example of the ROM mask bit option selection

for this product.

ROM Protect.

Selecting the DISABLE ROM PROTECT op-

tion READs the software program that is in the program

memory using ZiLOG’s internal factory test mode. How-

ever, none of the standard methods for reading or verifying

the code in the microcontroller uses an EPROM program-

mer. With this option disabled, ZiLOG is able to fully test

the ROM memory and provides its standard warranty for

the part. Selecting the ENABLE ROM PROTECT option ne-

gates the possibility of reading the code out of the part using

a tester, programmer, or any other standard method. ZiLOG

will be unable to test the ROM memory at any time prior

to customer delivery.

The ROM PROTECT option bit only affects the ability to

read the code and does not affect the operation of the part

in an application. If the ROM PROTECT option is disabled,

ZiLOG tests the part for ROM fallout and parts which fail

are not shipped to the customer. When the ROM PROTECT

option is enabled, ZiLOG cannot perform these tests on the

ROM. When ROM PROTECT is enabled, except for the im-

proper transfer of the code by ZiLOG, all ROM memory

software errors shall be the responsibility of the Buyer and

ZiLOG shall have no obligation to repair or replace product

containing software errors. Selecting the ENABLE ROM

PROTECT

option waives all warranties of ZiLOG, ex-

pressed or implied, on microcontrollers containing ROM

failures including, but not limited to, the implied warranty

of merchantability and fitness for a particular purpose.

RAM Protect.

Selecting the DISABLE RAM PROTECT op-

tion does not affect the RAM memory. RAM memory op-

erates as defined in this Product Specification for all address

locations. Selecting the ENABLE RAM PROTECT option,

allows protection (under software control) of a portion of

the RAM’s address space from being read or written.

System Clock Source.

Selecting the RC OSCILLATOR

ENABLE

option, configures the oscillator circuit on the mi-

crocontroller to work with an external RC circuit. Selecting

the CRYSTAL/OTHER CLOCK SOURCE option configures

the oscillator circuit to work with an external crystal, ce-

ramic resonator, or LC oscillator.

Oscillator Operational Mode.

Selecting the NORMAL

HIGH FREQUENCY OPERATION ENABLED

option en-

ables the part to operate using a standard crystal or resona-

tor, but it does not operate using a 32-kHz crystal. Selecting

the 32-KHZ OPERATION ENABLED option enables the mi-

crocontroller to work with a 32-kHz crystal and an external

feedback resistor—these must be supplied between the

XTAL1

and XTAL2 pins. (If RC OSCILLATOR ENABLED

is selected in the SYSTEM CLOCK SOURCE option, this

option defaults to the NORMAL HIGH FREQUENCY OP-

ERATION ENABLED

bit.)

WDT Mode.

Selecting the WDT ENABLED BY SOFT-

WARE ONLY

option operates the Watch Dog Timer (WDT)

when turned on under software control. Selecting the WDT

ENABLED AUTOMATICALLY AFTER RESET

option starts

the WDT automatically at RESET.There is no way to dis-

able or stop this mode, making it necessary in the code to

periodically clear the WDT to prevent it from resetting the

microcontroller. If the WDT ENABLED AUTOMATICAL-

LY AFTER RESET

option and the WDT DRIVEN BY SYS-

TEM CLOCK

option (if offered) are selected, the WDT nev-

Options

Option Selections

ROM Protect

Disable ROM Protect

Enable ROM Protect

RAM Protect

Disable RAM Protect

Enable RAM Protect

System Clock Source

RC Oscillator Enable

Crystal/Other Clock Source

Oscillator Operational Mode

Normal High-Frequency Operation

Enabled

32-kHz Crystal Operation Enabled

(Limits High-Frequency Operation)

WDT Mode

WDT Enabled by Software Only

WDT Enabled Automatically After

RESET

Auto Latch Mode

Disable Auto Latches

Enable Auto Latches

Port 0 Pull-Ups

Disable Pull-Ups

Enable Pull-Ups

Port 1 Pull-Ups

Disable Pull-Ups

Enable Pull-Ups

Port 2 Pull-Ups

Disable Pull-Ups

Enable Pull-Ups

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