ZiLOG Z08617 Manual page 8

Port 2 (P27-P20). Port 2 is an 8-bit, bit programmable, bi-
directional, NMOS compatible I/O port. These eight I/O
lines are configured under the software control program
for I/O. Port 2 can be programmed as bit-by-bit indepen-
dently, as input or output, or configured to provide open-
(a) Ports P20-P23
(b) Ports P24-P25
(c) Ports P26-P27
8
Z8615
OEN
Open-Drain
Input
OUT
IN
OEN
Open-Drain
Input
OUT
IN
OEN
Open-Drain
Input
OUT
IN
Figure 7. Port 2 Configuration
drain outputs (Figure 7). P26 and P27 have 2.4 Kohms
(± 25%) pull-up resistors and are capable of sourcing
2.4 mA. P24 and P25 have 10.4 Kohms (± 35%) pull-up
when configured as inputs.
Port 2
(I/O)
Pad
10.4 Kohms
Pad
2.4 Kohms
Pad
®
Z08617 NMOS Z8 8-B MCU
IT
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EYBOARD ONTROLLER