SZF2002 datasheet(70/76 Pages) PHILIPS

70 / 76 page

1998 Aug 26

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)

D0 to D7

A0 to A17

RAMCE

A2/ALE(1)

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

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)

SZF2002 数据表(PDF) 70 Page - NXP Semiconductors

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SZF2002 数据表(PDF) 70 Page - NXP Semiconductors

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