Z8 Microcontrollers
I/O Ports ZiLOG
5-21 UM001601-0803
5.6 PORT HANDSHAKE (Continued)
In applications requiring a strobed signal instead of the inter-
locked handshake, the Z8 MCU can satisfy this requirement as
follows:
• In the Strobed Input mode, data can be latched in the Port input
register using the
DAV input. The data transfer rate must
allow enough time for the software to read the Port before
strobing in the next character. The RDY output is ignored.
• In the Strobed Output Mode, the RDY input should be tied to
the
DAV output.
Figures 5-25 and 5-26 illustrate the strobed handshake connec-
tions.
Figure 5-25. Output Strobed Handshake on Port 2
P3
6
Z8
P2
0
- P2
7
P3
1
I/O
Device
DAV
RDY
Figure 5-26. Input Strobed Handshake on Port 2
Z8
P2
0
- P2
7
P3
1
I/O
Device
DAV
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