Z86L71 datasheet(16/61 Pages) ZILOG

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Z86L70/71/75/C71

IR/Low-Voltage Microcontroller

Zilog

1-16

P R E L I M I N A R Y

DS97LVO0500

PIN FUNCTIONS (Continued)

Port 3 (P36-P31). Port 3 is a 6-bit, CMOS-compatible

three fixed input and three fixed output port. Port 3 consists

of three fixed input (P33-P31) and three fixed output (P36-

P34), and can be configured under software control for In-

put/Output, Interrupt, and output from the counter/timers.

P31, P32, and P33 are standard CMOS inputs; outputs are

push-pull, except for P34, P35 which have floating drain

capability (controlled by P3M, D0).

Two on-board comparators process analog signals on P31

and P32 with reference to the voltage on P33. The analog

function is enabled by programming the Port 3 Mode Reg-

ister (bit 1). P31 and P32 are programmable as rising, fall-

ing, or both edge triggered interrupts (IRQ register bits 6

and 7). Pref1 and P33 are the comparator reference volt-

age inputs. Access to the Counter Timer edge detection

circuit is through P31 or P20 (see CTR1 description).

Port 3 provides the following control functions: three exter-

nal interrupt request signals (IRQ2-IRQ0).

Port 3 also provides output for each of the counter/timers

and the AND/OR Logic. Control is performed by program-

ming bits D5-D4 of CTRI, bit 0 of CTR0 and bit 0 of CTR2.

Table 2. Pin Assignments

I/O

C/T

Comp.

Int.

Ext

P31

AN1

IRQ2

P32

AN2

IRQ0

P33

VREF

IRQ1

P34

OUT

A01

P35

OUT

T16

P36

OUT

T8/16

P20

I/O

Figure 10. Port 3 Conﬁguration

P34 OUT

P32

P33

0 = P34 Standard Output

1 = P34 Comparator Output

PCON

P31

P33

P34

PAD

P34 OUT

0 Normal Control

1 8-bit Timer output active

CTR0

Counter/Timer

Reset condition.

Comp1

Comp2

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