Z86K13 Datasheet, PDF (12/24 Pages) Zilog, Inc. – CMOS Z8 8-Bit MCU Keyboard Controllers

Z86K13/K14/K15/K16/K17/K18
CMOS Z8® 8-Bit MCU Keyboard Controllers
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 resistors.
Outputs are capable of directly driving LED.
Zilog
Port 3 is configured under software control to provide four
external interrupt request signals (IRQ0-IRQ3).
Z86KXX
Port 3
(a) Port 3 P34-P37
Output
Pad
(b) Port 3 P30-P33
Input
10.4 kOhms
Pad
Figure 10. Port 3 Configuration
12
PRELIMINARY
DS97KEY0204