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SZF2002 データシート(PDF) 70 Page - NXP Semiconductors |
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SZF2002 データシート(HTML) 70 Page - NXP Semiconductors |
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70 / 76 page  1998 Aug 26 70 Philips Semiconductors Product specification Low voltage 8-bit microcontroller with 6-kbyte embedded RAM SZF2002 Fig.30 External RAM access w.r.t. RAMCE, OE and WE. (1) A0 to A3 alternative functions (PSEN, ALE, WR and RD) show Debug mode timing (Data bus carries low address on falling ALE edge. (2) Skipped ALE pulse because of MOVX instruction. (3) (Last) data sample moment. (4) Code fetch only if CE is active (not shown). CE and RAMCE are never active at the same time. handbook, full pagewidth MGM355 XCLK CODE FETCH(4) WE D0 to D7 A0 to A17 RAMCE OE A2/ALE(1) code in code in code in data out data in CODE FETCH(4) WRITE( )/READ( ) CODE FETCH(4) A3/PSEN(1) A0/RD(1) A1/WR(1) S1 to S6: one machine cycle S6 S2 S3 S4 S5 S6 S2 S3 S4 S1 S1 S5 S4 tXCLKH tXCLKL t(CEL) t(RCEL-OEL) t(OEL) t(RCEL-WEL) t(WEL) t(RCEH-OEH) (2) t(RCEH-WEH) tsu(RCEL-D) tsu(OEL-D) th(WEH-D) th(OEH-DZ) tsu(DZ-OEL) tsu(D-WEL) t(RCEL-DV) tsu(A-RCEL) tsu(D-SM) th(SM-D) Data sample moment(3) Code sample moment(3) th(RCEH-A) |
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