Z80230 查看數據表（PDF） - Zilog

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Z80230

Zilog SCC Serial Communication Controller

Zilog 

Application Note

The Z180™ Interfaced with the SCC at MHZ

(Continued)

HCT138

G

/Y9

A9

/G2A

/Y6

A18

/G2B

/Y5

/Y4

A17

C

/Y3

A16

B

/Y2

A15

A

/Y1

/Y0

/38000 ~

/30000 ~

/28000 ~

/20000 ~

/18000 ~

/10000 ~

/08000 ~ To 55257 /E Pin

/00000 ~ To 27C256 /E Pin

/RD

/MREQ

/WR

* /MEMR To 27C56 /OE,

55257 /OE Pin

* /MEMW To 55257 /WE Pin

* /RD to /OE Pin of 27C256 and 55257

/WR To /WE Pin of 55257

Figure 4a. Memory Interface Logic

/USRRAM

/IORQ

A15

/USRROM

4.7 K Ω x2

HCT10

/CSRAM To 55257 /CE Pin

/CSROM To 27C256 /CE Pin

Figure 4b. Memory Interface Logic

6-30

UM010901-0601

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