Continued) – Zilog Z16C35 User Manual

Page 195

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Application Note
The Z180™ Interfaced with the SCC at MHZ

7-18

(Continued)

Figure 14. Z180 to SCC Interface Logic (Example)

T1

T2

Tw

T3

1

6

100 ns

11

28

70 ns max

55 ns max

20 ns max

10 ns max

10 ns min

28

50 ns max

20 ns max

10 ns max

10 ns max

10 ns max

10 ns max

Address

/IORQ

/SCCSEL

HC74 /Q

HCT164 /CLR

HCT164 CLK

HCT164 Q0

20 ns max

20 ns max

HCT164 Q1

20 ns max

20 ns max

/RD (or, /WR)

RD* Q1

*SCCSEL

/SCCRD /[(RD*

/Q1* SCCSEL)

+ RESET]

15 ns max

9

55 ns max

15 ns max

30 ns ( > 0 ns)

200 ns typ. ( > 125 ns)

55 ns max

13

15 ns max

15 ns max

> 0 ns

Data (RD)

/SCCWR

Data (RD)

0 ns min

25

15

> 25 ns

120 ns max

15 ns min

24

29

210 ns

SCC

> 0 ns

22

30

SCC

Valid Data

Page 189 of 316

UM011002-0808

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