Z86L7208FSC datasheet(27/71 Pages) ZILOG

27 / 71 page

Z86C72/C92/L72/L92

Zilog

IR Microcontroller

DS97LVO0900

P R E L I M I N A R Y

6-27

Comparator Inputs. In Analog Mode, Port 3 (P31 and

P32) have a comparator front end. The comparator refer-

ence is supplied to P33 and Pref1. In this mode, the P33

internal data latch and its corresponding IRQ1 is diverted

to the SMR Sources (excluding P31, P32, and P33) as

shown in Figure 38. In digital mode, P33 is used as D3 of

the Port 3 input register which then generates IRQ1 as

shown in Figure 15.

When P31 is used as a counter timer input (demodulation

mode), Timer input is always taken from the P31 digital in-

put buffer (whether or not analog mode is enabled).

Notes: Comparators are powered down by entering STOP

mode. For P31-P33 to be used as a Stop-Mode Recovery

source, these inputs must be placed into digital mode.

Comparator Outputs. These may be programmed to be

output on P34 and P37 through the PCON register (Figure

15).

Figure 14. Port 3 Conﬁguration

P34 OUT

P37 OUT

P32

P33 (Pref2)

0 = P34, P37 Standard Output

1 = P34, P37 Comparator Output

PCON

P31

Pref1

P37

PAD

P34

PAD

P34 OUT

0 Normal Control

1 8-bit Timer output active

CTR0

Counter/Timer

Reset condition.

Z86L7208FSC Datasheet(PDF) 27 Page - Zilog, Inc.

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