Z86L82 Datasheet, PDF (23/80 Pages) Maxim Integrated Products – 28-Pin Low-Voltage IR Microcontrollers

Z86L82/85/88
28-Pin Low-Voltage IR Microcontrollers
16
Port 3 (P37–P31)
Port 3 (see Figure 8) is a 7-bit, CMOS-compatible, fixed I/O port. Port 3 consists of
three fixed input (P33–P31) and four fixed output (P37–P34) ports, and each can
be configured under software control for interrupt and output from the counter/tim-
ers. P31, P32, and P33 are standard CMOS inputs; P34, P35, P36, and P37 are
push-pull outputs.
P31 (AN1)
Pref
Z86L8X
MCU
P31
P32
P33
Port 3 (I/O)
P34
P35
P36
P37
R247 = P3M
D1
1 = Analog
0 = Digital
DIG.
Comp1
+
AN.
–
IRQ2, P31 Data Latch
P32 (AN2)
P33 (Ref2)
Comp1
+
–
IRQ0, P32 Data Latch
From Stop Mode
Recovery Source of SMR
IRQ1, P33 Data Latch
Figure 8. Port 3 Configuration
Two on-board comparators process analog signals on P31 and P32 with
reference to the voltage on Pref1 and P33. The analog function is enabled by
PS009007-1202