Z86L81 Datasheet, PDF (22/88 Pages) Maxim Integrated Products – 28-Pin Low-Voltage Infrared Microcontrollers

Z86L81/86/98
28-Pin Low-Voltage Infrared Microcontrollers
16
4
Z89L98
4
MCU
Port 0 (I/O)
Open-Drain
I/O
Out
In
Mask ^VCC
Option
Resistive
transistor
pull-up
Pad
In
0.4 V_DD
Trip Point Buffer
*Mask Selectable
(P00 to P03 only)
Figure 6. Port 0 Configuration
Port 2 (P27–P20)
Port 2 is an 8-bit, bidirectional, CMOS-compatible I/O port (see Figure 7). These
eight I/O lines can be independently configured under software control as inputs
or outputs. Port 2 is always available for I/O operation. A mask option is available
to connect eight pull-up transistors on this port. Bits programmed as outputs are
19-4615; Rev 0; 4/09