Z86L71 datasheet(50/61 Pages) ZILOG

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Z86L70/71/75/C71

IR/Low-Voltage Microcontroller

Zilog

1-50

P R E L I M I N A R Y

DS97LVO0500

FUNCTIONAL DESCRIPTION (Continued)

Low Voltage Detection/Protection. An on-chip Voltage

Comparator checks that the VCC is at the required level for

correct operation of the device. Reset is globally driven

when VCC falls below VLV (Vrf1).

Mask Selectable Options. There are six Mask Selectable

Options to choose from based on ROM code require-

ments.

Note: Internal Port 0/Pull-Up resistors remain connected

when port pins are configured as outputs.

The Low Voltage trip voltage (VLV) is less than 2.1V under

the following conditions:

Maximum (VLV) Conditions:

TA = 0°C, +55°C Internal clock frequency equal to or less

than 4.0 MHz

Note: The internal clock frequency is one-half the external

clock frequency.

The device is guaranteed to function normally until the Low

Voltage Protection trip point VLV is reached, below which

reset is globally driven. The device is guaranteed to func-

tion normally at supply voltages above the VLV trip point for

the temperatures and operating frequencies in maximum

VLV conditions. The actual VLV trip point is a function of

temperature and process parameters (Figure 39).

Permanent Watch-Dog

Timer

On/WDT command invoked

RAM Protect

On/Off

ROM Protect

On/Off

32 kHz XTAL

On/Off

Port 00-07 Pull-ups

On/Off

Port 31-33 Pull-ups

On/Off

Port 20-27 Pull-ups

On/Off

Figure 39. Typical Z86L7X Low Voltage vs

Temperature at 8 MHz

1.8

1.6

1.4

1.2

0.8

0.6

0.4

0.2

VLV

Temperature

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