z86l88 ZiLOG Semiconductor, z86l88 Datasheet - Page 22

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

PS024102-0804
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.
Figure 7. Port 2 Configuration
Out
In
Open-Drain
I/O
Z86L88
MCU
Port 2 I/O
Low-Voltage IR Microcontroller
Option
Mask
Pad
V
CC
Resistive transistor
pull-up
Z86L88
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