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HMS87C1102 Datasheet(PDF) 40 Page - Hynix Semiconductor |
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HMS87C1102 Datasheet(HTML) 40 Page - Hynix Semiconductor |
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40 / 88 page  HMS87C130XA/120XA/110XA Apr. 2001 ver1.0 37 9.4 RD and RDIO registers RD is a 4-bit bidirectional I/O port (address C6H). Each pin can be set individually as input and output through the RDIO register (address C7H) And RD0, RD1 have a function of pull-up transistor by set- ting the PUPSEL2 and PUPSEL3 of PUPSEL register. . Figure 9-5 Registers of Port RD RD2 RD1 RD0 INPUT / OUTPUT DATA 0 : INPUT PORT 1 : OUTPUT PORT DIRECTION SELECT RD Data Register RD ADDRESS : C6H RESET VALUE : Undefined RD Direction Register RDIO ADDRESS : C7H RESET VALUE : -----0000 RD3 -- - - - Pull-up Selection Register PUPSEL ADDRESS : CCH RESET VALUE : ----0000 - - - - - 0 : No Pull-up 1 : With Pull-up 0 : No Pull-up 1 : With Pull-up RD0 Pull-up RD1 Pull-up PUPSEL2 PUPSEL3 --- - |
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