z86e72 ZiLOG Semiconductor, z86e72 Datasheet - Page 34

• Manufacturer Part Number: z86e72
• Description: Otp Microcontroller
• Manufacturer: ZiLOG Semiconductor

PS008704-0507
Port 2 (P27–P20)
Port 2 is an 8-bit, bidirectional, CMOS-compatible I/O port (see
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 software option is avail-
able to connect eight 200 K
grammed as outputs are globally programmed as either push-pull or open-drain.
Port 2 can be placed under handshake control. 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) assigned to Bit 7, Port 2.
Out
Open-Drain
In
OEN
Z86E7X
MCU
Figure 15. Port 1 Configuration
Ω
(±50%) pull-up resistors on this port. Bits pro-
Port 2 (I/O)
Optional
Handshake Controls
/DAV2 and RDY2
(P31 and P36)
(E72 Only)
Program
Option
OTP Microcontroller
Pad
V
Figure
CC
200 KΩ +50%
resistive transistor
pull-ups
16). These
30