z86d73 ZiLOG Semiconductor, z86d73 Datasheet - Page 28
z86d73
Manufacturer Part Number
z86d73
Description
40/44/48-pin Low-voltage
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z86D73.pdf
(92 pages)
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PS019402-1103
Port 2 (P27–P20)
Open-Drain
I/O
Out
In
Port 2 is an 8-bit, bidirectional, CMOS-compatible I/O port (see Figure 12). 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 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.
Figure 12. Port 2 Configuration
Z86D73
OTP
P
R
E
L
I
M
I
N
A
Port 2 (I/O)
40/44/48-Pin Low-Voltage IR OTP
R
Y
Mask
Option
Pad
V
CC
Resistive
transistor
pull-up
Z86D73
22
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