UPD16664 View Datasheet(PDF) - NEC => Renesas Technology
Part Name
Description
Manufacturer
UPD16664 Datasheet PDF : 52 Pages
| |||
µ PD16664
4. DATA BUS
The byte data ordering on the data bus is little endian, in common with most NEC and Intel buses.
4.1 16-bit Data Bus (BMODE = L)
Byte access
Address incrementing
direction
D0 to D7
00000H
00002H
00004H
:
:
D8 to D15
00001H
00003H
00005H
:
:
Word access
Address incrementing
direction
D0 to D7
00000H
00002H
00004H
:
:
D8 to D15
If the system accesses the µ PD16664 in word(16-bit) or byte(8-bit) units, /UBE (upper byte enable) and A0 specify
whether bytes D0 to D7 or bytes D8 to D15 have valid data.
/CS
/OE
/WE
H
X
X
L
L
H
L
H
L
L
H
H
L
X
X
Remark X : Don’t care
Hi-Z : High impedance
/UBE
X
L
L
H
L
L
H
X
H
A0
MODE
X
Not selected
L
Read
H
L
L
Write
H
L
X
Output
H
Disable
I/O
D0 to D7
D8 to D15
Hi-Z
Hi-Z
Dout
Dout
Hi-Z
Dout
Dout
Hi-Z
Din
Din
X
Din
Din
X
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Data Sheet S13780EJ1V0DS00
7
Share Link: 