M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 342

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATION
17.1 Memory expansion
17–8
Fig. 17.1.6 Timing at which data is read from an external memory
17.1.3 Points in memory expansion
Address output and data input
(1) Reading data
A
A
output enable signal
8
16
/
D
External memory
/D
external memory. This floating state is maintained from t
signal till t
and the formulas to calculate t
or following address output because the external data bus is multiplexed with the external address
bus. (Refer to “(3) Precautions on memory expansion.”)
chip select signal
Figure 17.1.6 shows the timing at which data is read from an external memory.
When reading data, the external data bus is placed in a floating state, and data is read from the
Consider timing during data read to avoid collision between the data being read–in and the preceding
External memory
8
(Read signal)
–A
0
–A
1 This applies when the external data bus has a width of 16 bits (BYTE = “L”).
2 If one of the external memory’s specifications is smaller than
3 If one of the external memory’s specifications is greater than
15
External memory
23
data colliding with the head of address.
address colliding with the head of data.
/D
/D
data output
15
7
pzx(E–P1Z/P2Z)
1
CE, S
after the rising edge of the E signal. Table 17.1.4 lists the values of t
OE
E
Address
pzx(E–P1Z/P2Z)
7702/7703 Group User’s Manual
t
en
(CE)
t
a
(CE)
, t
Refer to “(3) Precautions on memory expansion.”
Refer to “(3) Precautions on memory expansion.”
.
en
, t
t
en
(S)
t
a
a
t
(S)
pxz
(OE)
(OE)
t
(E-P1Z/P2Z)
w(EL)
_
t
su
(P1D/P2D-E)
2
Data
t
t
pzx
pxz
pxz(E–P1Z/P2)
(E-P1Z/P2Z)
(E-P1Z/P2Z)
t
t
DF
pzx
, t
, there is a possibility of the tail of
, there is a possibility of the tail of
(E-P1Z/P2Z)
dis
: Specifications of the M37702
after the falling edge of the E
(The others are specifications of
external memory.)
(OE)
3
Address
pxz(E–P1Z/P2Z)
_