Continued), Interrupt acknowledge cycle timing – Zilog Z16C35 User Manual
Page 193
Application Note
The Z180™ Interfaced with the SCC at MHZ
7-16
(Continued)
If you are running your system slower than 8 MHz, remove
the HCT74, D-Flip/Flop in front of HCT164. Connect the
inverted CSSCC to the HCT164 B input. This is a required
Flip/Flop because the Z180 timing specification on tIOD1
(Clock High to /IORQ Low, IOC=0) is maximum at 55 ns
This is longer than half the PHI clock cycle. Sample it using
the rising edge of clock, otherwise, HCT164 does not
generate the same signals.
The RESET signal feeds the SCC /RD and /WR through
HCT27 and HCT02 to supply the hardware reset signal. To
reduce the gate count, drop these gates and make the
SCC reset by its software command. The SCC software
reset - 0C0h to Write Register 9, “Hardware Reset
command” has the same effect as hardware reset by
“Hardware.”
Interrupt Acknowledge Cycle Timing
The primary timing differences between the Z180 and
SCC occur in the Interrupt Acknowledge cycle. The SCC
timing parameters that are significant during Interrupt
Acknowledge cycles are in Table 10. The Z180 timing
parameters are in Table 10. The reference numbers in
Tables 10 and 11 refer to Figure 13.
Figure 13. SCC I/O Read/Write Cycle Timing
This circuit works when [(Lower HCT164’s CLK
≠
to Z180 /WAIT
≠
) + tws D CK Q A B /CLR CK Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 A B CLR CK Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 HCT74 HCT164 HCT04 HCT04 HCT27 HCT02 HCT27 HCT27 HCT04 HCT04 HCT164 HCT04 HCT02 /INTACK HCT02 HCT02 /CSSCC /WR Ø /RD /RESET /MREQ /M1 Internal /WAIT Input To To 85C30 To To To 4.7K Page 187 of 316 UM011002-0808
Z180
/WAIT
/INTACK
85C30
/RD
85C30
/WR
85C30
/CE