Z86L04/L08
Z8 8-Bit Cost-Effective Microcontrollers
Zilog
PIN FUNCTIONS
(Continued)
Port 3, P33-P31.
Port 3 is a 3-bit, CMOS, compatible port
with three fixed input (P33-P31) lines. These three input
lines can be configured under software control as digital
Schmitt-trigger inputs or analog inputs.
These three input lines are also used as the interrupt
sources IRQ0-IRQ3 and as the timer input signal T
IN
(Fig-
ure 9).
Z8
Port 3
R247 = P3M
0 = Digital
1 = Analog
D1
TIN
DIG.
PAD
P31 (AN1)
P31 Data Latch
IRQ2
+
AN.
-
IRQ3
PAD
P32 (AN2)
PAD
P32 Data Latch
+
-
P33 (REF)
IRQ0
P33 Data Latch
V
cc
IRQ1
IRQ 0,1,2 = Falling Edge Detection
IRQ3
= Rising Edge Detection
Figure 9. Port 3 Configuration
12
PRELIMINARY
DS97LVO0901
ZILOG [ ZILOG, INC. ]
