Z86L825 Datasheet, PDF (22/79 Pages) Zilog, Inc. – 20-Pin Low-Voltage IR Microcontrollers

Z86L825/826/827
20-Pin Low-Voltage IR Microcontrollers
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
200 KΩ (±50%) pull-up transistors on this port. Bits programmed as outputs are
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 an AND gate that can be used to wake up
the part. P20 can be programmed to access the edge-detection circuitry in
demodulation mode. See Figure 7.
Z86L82X
MCU
Port 2 I/O
Open-Drain
I/O
Mask
Option
V_CC
200 KOhms
Pad
Out
In
Figure 7. Port 2 Configuration
PS008808-1203
PRELIMINARY