Z86L0808PSC datasheet(13/26 Pages) ZILOG

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Z86L04/L08

Zilog

Z8 8-Bit Cost-Effective Microcontrollers

DS97LVO0901

P R E L I M I N A R Y

Comparator Inputs. Two analog comparators are added

to input of Port 3, P31 and P32, for interface flexibility. The

comparators reference voltage P33 (REF) is common to

both comparators.

Typical applications for the on-board comparators; Zero

crossing detection, A/D conversion, voltage scaling, and

threshold detection. In analog mode, P33 input functions

serve as a reference voltage to the comparators.

The dual comparator (common inverting terminal) features

a single power supply which discontinues power in STOP

mode. The common voltage range is 0-4V when the VCC

is 5.0V; the power supply and common mode rejection ra-

tios are 90 dB and 60 dB, respectively.

Interrupts are generated on either edge of Comparator 2's

output, or on the falling edge of Comparator 1's output.

The comparator output is used for interrupt generation,

Port 3 data inputs, or TIN through P31. Alternatively, the

comparators can be disabled, freeing the reference input

(P33) for use as IRQ1 and/or P33 input.

FUNCTIONAL DESCRIPTION

The following special functions have been incorporated

into the Z86L04/L08 devices to enhance the standard Z8

core architecture to provide the user with increased design

flexibility.

RESET. This function is accomplished by means of a Pow-

er-On Reset or a Watch-Dog Timer Reset. Upon power-

up, the Power-On Reset circuit waits for TPOR ms, plus 18

clock cycles, then starts program execution at address

000C (Hex) (Figure 10). The control registers' reset values

are shown in Table 3.

Figure 10. Internal Reset Conﬁguration

POR

(Cold Start)

P27

(Stop Mode)

Delay Line

POR ms

18 CLK

Reset Filter

Chip

Reset

XTAL OSC

INT OSC

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