3886 datasheet(97/380 Pages) RENESAS

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HARDWARE

1-72

3886 Group User’s Manual

q Read command

The microcomputer enters the read mode by inputting command

code “0016” in the first cycle. The command code is latched into

___

the internal command latch at the rising edge of the WE input.

When the address of a memory location to be read is input in the

second cycle, with control signals input at the timing shown in

Figure 70, the M38869FFAHP/GP outputs the contents of the

specified address from the data I/O pins to the external.

The read mode is retained until any other command is latched into

the command latch. Consequently, once the M38869FFAHP/GP en-

ters the read mode, the user can read out the successive memory

contents simply by changing the input address and executing the

second cycle only. Any command other than the read command

must be input beginning from its command code over again each

time the user execute it. The contents of the command latch immedi-

ately after power-on is 0016.

Fig. 70 Timings during reading

FUNCTIONAL DESCRIPTION

Address

Valid address

tWC

tCH

tCS

tRC

ta(CE)

tDF

tWRR

tWP

tRRW

ta(OE)

tDH

tVSC

tCLZ

tOLZ

tDS

ta(AD)

VIH

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VPPH

VPPL

Data

VPP

Dout

0016

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