Z86L79 datasheet(13/58 Pages) ZILOG

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Z86L79/80

Zilog

Low-Voltage Microcontroller

P R E L I M I N A R Y

3-13

PIN FUNCTIONS

XTAL1 Crystal 1 (time-based input). This pin connects a

parallel-resonant crystal, ceramic resonator, LC, or RC

network or an external single-phase clock to the on-chip

oscillator input.

XTAL2 Crystal 2 (time-based output). This pin connects a

parallel-resonant, crystal, ceramic resonant, LC, or RC

network to the on-chip oscillator output.

Port 0 (P07-P00). Port 0 is an 8-bit, bidirectional, CMOS

compatible port. These eight I/O lines are configured un-

der software control as a nibble I/O port. The output drivers

are push-pull in this configuration.

Using single trip point ROM mask option, Port 00-03 can

be programmed to allow direct interface to applications

that require single point comparison like mouse/trackball

IR sensors. ROM mask option will enable the 0.4 VDD trip

Point Buffers on these inputs.

An optional 200 kOhms (port wide) pull-up is available as

a mask option on all bits for the L79/L80 versions.

These pull-ups are disabled when configured (bit by

bit) as an output.

Figure 9. Port 0 Conﬁguration

Z86L7X

MCU

Port 0 I/O

OEN

Out

PAD

200 k

Ω

**Mask Selectable

Mask

Option

0.4 VDD

Trip Point Buffer

0.5 VDD

Trip Point Buffer

Z86L79 Datasheet(PDF) 13 Page - Zilog, Inc.

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