Z86L88 Datasheet, PDF (22/80 Pages) Zilog, Inc. – INFRARED REMOTE CONTROLLERS

Z86L88
Low-Voltage IR Microcontroller
15
Port 2 (P27–P20)
Port 2 is an 8-bit, bidirectional, CMOS-compatible I/O port. 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 globally pro-
grammed as either push-pull or open-drain. The POR resets with the
8 bits of Port 2 configured as inputs.
Port 2 also has an 8-bit input OR and AND gate that can be used to wake up the
part. P20 can be programmed to access the edge-detection circuitry in demodula-
tion mode. See Figure 7.
Z86L88
MCU
Port 2 I/O
Open-Drain
I/O
Out
In
Figure 7. Port 2 Configuration
19-4614; Rev 0; 4/09
Mask
Option
V_CC
Resistive transistor
pull-up
Pad