7733 Datasheet, PDF (424/940 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATIONS
17.1 Memory expansion
M37733MHBXXXFP
A1 to A7
CNVSS
BYTE
ALE
A8/D8 to
A15/D15
A16/D0 to
A23/D7
E
AC573
DQ
LE OE
AC573
DQ
LE OE
ALS245A^g2
AB
DIR OC
ALS245A^g2
AB
DIR OC
Address bus
Data bus (odd)
Data bus (even)
These circuits make the rising edge of
the write signal earlier by 1/2 1, so
that the write hold time is extended.
1
R/W
1D1Q _2D
AC04
1T
2T 2Q
AC74
1
AC04 ^g1
BHE
A0
XIN
XOUT
AC32
RD
WO
WE
AC32
16 MHz
Circuit conditions: Wait 1 is valid,
1=
f(XIN) f(XIN) f(XIN)
2 , 8 , 16
f(XCIN)
or
,
2
g1 Make sure that the propagation delay time is 40.5 ns or less.
g2 Make sure that the output enable time is 5 ns or more and the output disable time is
42.5 ns or less.
Fig. 17.1.11 Bus buffer usage example (2) (when a memory which requires a long data hold time for writing
is connected)
7733 Group User’s Manual
17–17