Z86L04 Datasheet, PDF (13/26 Pages) Zilog, Inc. – Z8 8-Bit Cost-Effective Microcontrollers

Zilog
Z86L04/L08
Z8 8-Bit Cost-Effective Microcontrollers
Comparator Inputs. Two analog comparators are added The dual comparator (common inverting terminal) features
to input of Port 3, P31 and P32, for interface flexibility. The a single power supply which discontinues power in STOP
comparators reference voltage P33 (REF) is common to
both comparators.
mode. The common voltage range is 0-4V when the V_CC
is 5.0V; the power supply and common mode rejection ra-
1
Typical applications for the on-board comparators; Zero ^{tios are 90 dB and 60 dB, respectively.}
crossing detection, A/D conversion, voltage scaling, and
threshold detection. In analog mode, P33 input functions
serve as a reference voltage to the comparators.
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 T_IN 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 T_POR 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.
POR
(Cold Start)
P27
(Stop Mode)
INT OSC
Delay Line
T_POR ms
XTAL OSC
18 CLK
Reset Filter
Chip
Reset
Figure 10. Internal Reset Configuration
DS97LVO0901
PRELIMINARY
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