z86l88 ZiLOG Semiconductor, z86l88 Datasheet - Page 23

• Manufacturer Part Number: z86l88
• Description: Low-voltage Ir Microcontroller
• Manufacturer: ZiLOG Semiconductor

PS024102-0804
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.
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
P31 (AN1)
Pref
From Stop Mode
Recovery Source of SMR
P32 (AN2)
P33 (Ref2)
+
–
+
–
Z86L88
MCU
Comp1
Comp1
R247 = P3M
DIG.
AN.
P31
P32
P33
P34
P35
P36
P37
D1
Port 3 (I/O)
1 = Analog
0 = Digital
Low-Voltage IR Microcontroller
IRQ2, P31 Data Latch
IRQ0, P32 Data Latch
IRQ1, P33 Data Latch
Z86L88
16