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Z86E72 Datasheet(PDF) 22 Page - Zilog, Inc.

No. de Pieza. Z86E72
Descripción  OTP IR MICROCONTROLLERS
Descarga  74 Pages
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Fabricante  ZILOG [Zilog, Inc.]
Página de inicio  http://www.zilog.com
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Z86E72 Datasheet(HTML) 22 Page - Zilog, Inc.

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Z86E72/E73
OTP IR Microcontrollers
1-22
P R E L I M I N A R Y
DS96LVO1100
PIN FUNCTIONS (Continued)
Port 2 (P27-P20). Port 2 is an 8-bit, bidirectional, CMOS
compatible I/O port. These eight I/O lines can be indepen-
dently configured under software control as inputs or out-
puts. Port 2 is always available for I/O operation. A soft-
ware option is available to connect eight 200 kOhms
(
±50%) pull-up resistors on this port. Bits programmed as
outputs are globally programmed as either push-pull or
open-drain. Port 2 may be placed under handshake con-
trol. In this configuration, Port 3 lines, P31 and P36 are
used as the handshake controls lines /DAV2 and RDY2.
The handshake signal assignment for Port 3, lines P31
and P36 is dictated by the direction (input or output) as-
signed to Bit 7, Port 2 (Figure 10).
The CCP wakes up with the eight bits of Port 2 configured
as inputs with open-drain outputs.
Port 2 also has an 8-bit input OR and an AND gate which
can be used to wake up the part. P20 can be programmed
to access the edge selection circuitry (Figure 21).
Figure 16. Port 2 Configuration
Open-Drain
OEN
Out
In
PAD
Port 2 (I/O)
Optional
Handshake Controls
/DAV2 and RDY2
(P31 and P36)
(L72/E72 Only)
Z86LXX
MCU
VCC
200 k
Mask
Option


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