Z86318 Datasheet, PDF (13/26 Pages) Zilog, Inc. – Z8 MCU 8-BIT MICROCONTROLLER

Z86318
Z8^® MCU 8-Bit Microcontroller
Resistance Tolerance (0 - +40°C)
25K
1
Min. Max. Typ.
Pull-Down 5.2K _{8.9K 7.5K}
Pull-Up 18K 30K 25K
7.5K
Divenb
/Open-Drain
/OE
Out
Pad
In
0.4 VDD
Trip Point Buffer
Figure 9. Port 2 P27-P24 Configuration
Port 3 (P33, P32, P31). Port 3 is a 3-bit, CMOS-compati-
ble port with three fixed input lines (P33–P31). These three
lines can also be used as the interrupt sources IRQ2,
IRQ1, and IRQ0. P31 can also be configured as a timer in-
put.
All three lines can be configured globally by means of ma
ROM mask option for a 100 Kohm pull-up or pull-down re-
sistor (Figure 10), or no pull-up/pull-down. No current is
drawn if pull-up/pull-down is disabled.
PRELIMINARY
13