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MB90480 Datasheet(PDF) 74 Page - Fujitsu Component Limited. |
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MB90480 Datasheet(HTML) 74 Page - Fujitsu Component Limited. |
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74 / 120 page 
MB90480/485 Series 74 18. External Bus Pin Control Circuit The external bus pin control circuit controls the external bus pins used to expand the CPU address/data bus connections to external circuits. (1) Register List (2) Block Diagram • Auto ready function select register (ARSR) • External address output control register (HACR) • Bus control signal select register (EPCR) Initial value Address : 0000A5H 0011--00B Initial value Address : 0000A6H ********B Initial value Address : 0000A7H 1000*10-B W − * : Write only : Not used : May be either “1” or “0” WW W ⎯⎯ WW 15 14 13 12 11 10 9 8 IOR0 W IOR1 HMR1 HMR0 ⎯⎯ LMR1 LMR0 W W W W WWW 76 5 4 3 2 1 0 E22 W E23 E21 E20 E19 E18 E17 E16 WW W W W W ⎯ 15 14 13 12 11 10 9 8 RYE W CKE HDE IOBS HMBS WRE LMBS ⎯ P3 P2 P1 P0 P0 P5 RB P4 P5 Access control Access control Address control Data control P0 direction P0 data |
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