ZiLOG Z8

Z8 Microcontrollers
ZiLOG I/O Ports
UM001601-0803 5-11
Figure 5-14. Port 2 Configuration with Open-Drain Capability, Auto Latch, Schmitt-Trigger and SPI
P27 OUT
PIN
SPI Active
P27 IN
0 SOI D0 Enable
OPEN-DRAIN
R ≈ 500 KΩ
Auto Latch
P27
P20 OE
PIN
P20 OUT
P20 IN
OPEN-DRAIN
R ≈ 500 KΩ
Auto Latch
P20
SPI EN
SPI DO
P27 OE
SPI
SPI DO
SPI
Standard
Standard
1 P27 OUT
*SPI must be enabled with D0
D2
SCON
or
SPI DI