ZiLOG Z8

Z8 Microcontrollers
ZiLOG I/O Ports
UM001601-0803 5-9
5.4 PORT 2
Port 2 is a general-purpose port. Figure 5-2 shows a block dia-
gram of Port 2. Each of its lines can be independently pro-
grammed as input or output via the Port 2 Mode Register (F6H)
as seen in Figure 5-11. A bit set to a 1 in P2M configures the cor
-
responding bit in Port 2 as an input, while a bit set to 0 configures
an output line.
Figure 5-11. Port 2 I/O Mode Configuration
D7 D6 D5 D4 D3 D2 D1 D0
(Write-Only)
1 = Input
Port 2 Mode
0 = Output
Port 2 Mode Register (P2M)
Register F6H
Figure 5-12. Port 2 Configuration with Open-Drain Capability, Auto Latch, and Schmitt-Trigger
P21-P26 OE
PIN
P21-P26 OUT
P21-P26 IN
2.3V Hysteresis @ V
CC
= 5.0V
OPEN-DRAIN
1.5
R ≈ 500 KΩ
Auto Latch
P21-P26