Z86E04 Datasheet, PDF (22/44 Pages) Zilog, Inc. – CMOS Z8 OTP MICROCONTROLLERS

Z86E04/E08
CMOS Z8 OTP 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).
Z86E04
Za8nd
Z86E08
Port 3
PAD
P31 (AN1)
PAD
P32 (AN2)
PAD
P33 (REF)
0 = Digital
R247 = P3M 1 = Analog
D1
DIG.
+
AN.
-
+
-
TIN
P31 Data Latch
IRQ2
IRQ3
P32 Data Latch
IRQ0
V_cc
IRQ 0,1,2 = Falling Edge Detection
IRQ3 = Rising Edge Detection
Figure 9. Port 3 Configuration
P33 Data Latch
IRQ1
22
PRELIMINARY
DS97Z8X1104