z86e54 ZiLOG Semiconductor, z86e54 Datasheet - Page 29

• Manufacturer Part Number: z86e54
• Description: Z8 512 Byte Otp Mcu
• Manufacturer: ZiLOG Semiconductor

PS020102-1003
Open
Out
In
Auto Latch. The Auto Latch places valid CMOS levels on all CMOS inputs
(except P33, P32, P31) that are not externally driven. A valid CMOS level, rather
than a floating node, reduces excessive supply current flow in the input buffer. On
Power-up and Reset, the Auto Latch sets the ports to an undetermined state of 0
or 1. The default condition is AUTO LATCH ENABLED. The Auto Latch can be
disabled by programming the AUTO LATCH DISABLE option bit.
Port 2, P27–P20. Port 2 is an 8-bit, bit programmable, bidirectional, Schmitt-trig-
gered CMOS-compatible I/O port. These eight I/O lines can be configured under
software control to be inputs or outputs, independently. Bits programmed as out-
puts can be globally programmed as either push-pull or open-drain (Figure 10).
1.5
2.5 Hysteresis V
Z8
Figure 9.Port 0 Configuration
CC
R ~ ~ 500 kΩ
@ 5.0V
Port 0 (I/O)
Z8
Auto Latch Option
®
512 Byte OTP MCU
PAD
Z86E54
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