SZF2002 datasheet(68/76 Pages) PHILIPS

68 / 76 page

1998 Aug 26

Philips Semiconductors

Product speciﬁcation

Low voltage 8-bit microcontroller with

6-kbyte embedded RAM

SZF2002

Fig.29 External program memory access, w.r.t. CE, 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.

handbook, full pagewidth

MGM354

XCLK

CODE FETCH

A0 to A17

D0 to D7

A2/ALE(1)

code in

data out

data in

CODE FETCH

WRITE(

)/READ(

)

CODE FETCH

A3/PSEN(1)

A0/RD(1)

A1/WR(1)

S1 to S6: one machine cycle

tXCLKL

t(CEL-OEL)1

t(CEL-WEL)1

th(CEH-A)1

t(CEL-DV)3

tsu(A-CEL)4

tsu(A-CEL)1

th(CEH-A)4

th(SM-D)4

tsu(D-SM)4

tsu(CEL-D)2

tsu(OE-D)2

tsu(D-SM)2

tsu(DZ-OEL)

tsu(D-WEL)3

th(DZ-OEH)

t(WEL)1

t(OEL)1

t(CEL)1

t(CEH-OEH)4

t(CEH-OEH)1

(2)

tXCLKH

TCY(XCLK)

(3)

Code sample moment

th(SM-D)2

t(CEH-WEH)1

th(WEH-D)3

tsu(CEL-D)4

tsu(OE-D)4

code in

t(CEL-OEL)4

(3)

Data sample moment

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