ZiLOG Z8

Z8 Microcontrollers
ZiLOG Serial I/O
UM001601-0803 9-13
Figure 9-16. SPI Data In/Out Configuration
P27 OUT
PIN
SPI Active
P27 IN
0 SOI D0 Enable
OPEN-DRAIN
Auto Latch
P27
P20 OE
PIN
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
R ≈ 500 KΩ