Z86U18 Datasheet, PDF (12/30 Pages) Zilog, Inc. – USB Device Controller with CMOS Z86K15 MCU

Z86U18
USB Device Controller with CMOS Z86K15 MCU
PIN FUNCTIONS (Continued)
Port 3 (P37-P30). Port 3 is an 8-bit, CMOS-compatible
four-fixed-input (P33-P30) and four-fixed-output (P37-
P34) I/O port. Port 3 inputs have 10.4 Kohm pull-up resis-
tors and outputs are capable of directly driving LED.
Zilog
Port 3 is configured under software control to provide the
following control functions: three external interrupt request
signals (IRQ0-IRQ2)..
Z86U18
Port 3
(a) Port 3 P34-P37
Output
Pad
(b) Port 3 P30-P33
Input
10.4 Kohms
Pad
Figure 11. Port 3 ConÞguration
12
PRELIMINARY
DS97KEY0102