UPD16663 View Datasheet(PDF) - NEC => Renesas Technology
Part Name
Description
Manufacturer
UPD16663 Datasheet PDF : 40 Pages
| |||
µPD16663
3. DATA BUS
The byte data ordering on the data bus is little endian, which is the format commonly used in most NEC and
Intel products.
(1) 16-bit data bus (BMODE = L)
Byte access
Address increases →
as shown
D0 to D7
00000H
00002H
00004H
:
:
D8 to D15
00001H
00003H
00005H
:
:
Word access
Address increases →
as shown
D0 to D7
00000H
00002H
00004H
:
:
D8 to D15
In the same way as access from the system can be performed in word (16-bit) and byte (8-bit) units, valid data
is indicated by D0 to D7 and/or D8 to D15, by means of the /UBE signal (higher byte enable) and A0.
/CS
H
L
L
L
L
/OE
×
L
H
H
×
/WE
×
H
L
H
×
/UBE
×
L
L
H
L
L
H
×
H
A0
×
L
H
L
L
H
L
×
H
MODE
Not Selected
Read
Write
Output Disable
I/O
D0 to D7
D8 to D15
Hi-z
Hi-z
Dout
Dout
Hi-z
Dout
Dout
Hi-z
Din
Din
×
Din
Din
×
Hi-z
Hi-z
Hi-z
Hi-z
Remark ×= Don't Care, Hi-z= High impedance
6
Data Sheet S13392EJ1V0DS00
Share Link: 