Z86L81 Datasheet, PDF (23/88 Pages) Maxim Integrated Products – 28-Pin Low-Voltage Infrared Microcontrollers

Z86L81/86/98
28-Pin Low-Voltage Infrared Microcontrollers
17
globally programmed as either push-pull or open-drain. The POR resets with the
eight bits of Port 2 configured as inputs.
Port 2 also has an 8-bit input OR and AND gate, which can be used to wake up
the part. P20 can be programmed to access the edge-detection circuitry in
demodulation mode.
Z89L98
MCU
Port 2 (I/O)
Open-Drain
I/O
Out
Mask ^VCC
Option
Resistive
transistor
pull-up
Pad
In
Figure 7. Port 2 Configuration
Port 3 (P37–P31)
Port 3 is a 7-bit, CMOS-compatible fixed I/O port (see Figure 8). Port 3 consists of
three fixed input (P33–P31) and four fixed output (P37–P34), and each can be
configured under software control for interrupt and output from the counter/timers.
P31, P32, and P33 are standard CMOS inputs; P34, P35, P36 and P37 are push-
pull outputs.
19-4615; Rev 0; 4/09