Z86C61 Datasheet, PDF (16/46 Pages) Zilog, Inc. – CMOS Z8 MICROCONTROLLER

PIN FUNCTIONS (Continued)
Z86C61/62/96
Z8^® MICROCONTROLLER
Port 3 (P37-P30). Port 3 is an 8-bit, CMOS compatible four-
fixed input and four-fixed output port. These eight I/O
lines have four-fixed (P33-P30) input and four-fixed (P37-
P34) output ports. Port 3, when used as serial I/O, are
programmed as serial in and serial out, respectively
(Figure 13).
MCU
Port 3
(I/O or Control)
Out
In
PAD
Port 3 Output Configuration
R ≈ 500 KΩ
Port 3 Input Configuration
Figure 13. Port 3 Configuration
PAD
Auto Latch
16