Z87C33 Datasheet, PDF (12/72 Pages) Zilog, Inc. – CMOS Z8® MCU Consumer Controller Processor

Z87C33
CMOS Z8“ MCU Consumer Controller Processor
6
4
Port 0
Z8
4
(I/O)
Open-Drain
OE
PAD
Out
1.5
In
2.3 Hysteresis V_CC @ 5.0V
R ~~ 500 kΩ
Auto Latch
(Mask Option)
Figure 3. Port 0 Configuration
Port 2 (P27–P20). Port 2 is an 8-bit, bidirectional, CMOS-compatible I/O port.
These eight I/O lines are configured under software control as an input or output,
independently. Port 2 is always available for I/O operation. The input buffers are
Schmitt-triggered. Bits programmed as outputs may be globally programmed as
either push-pull or open-drain. Low-EMI output buffers are globally programmed
by the software. See Figure 5.
PS015601-1003