參數(shù)資料
型號(hào): UPD16662N-051
廠商: NEC Corp.
英文描述: CONNECTOR ACCESSORY
中文描述: 連接器附件
文件頁(yè)數(shù): 6/36頁(yè)
文件大?。?/td> 260K
代理商: UPD16662N-051
6
μ
PD16662
Data bus
The byte data lined up on the data bus is based on the Little Endian - an NEC/Intel-series bus.
1. 16 bit data bus (BMODE = L)
Bytes (8 bytes) access
D0 to D7
D8 to D15
Addresses proceed as
shown on right.
00000H
00002H
00004H
:
:
:
00001H
00003H
00005H
:
:
:
Words (16 bits) access
D0 to D7
D8 to D15
Addresses proceed as
shown on right.
00000H
00002H
00004H
:
:
:
For the access from the system to be performed in units of words (16 bits), or of bytes (8 bytes), the /UBE (high
byte enable) and A0 are used to show whether valid data are in the bytes of either (or both) of D0 to D7 and D8 to
D15.
/CS
/OE
/WE
/UBE
A0
MODE
I/O
D0 to D7
D8 to D15
H
X
X
X
X
Not Selected
Hi-Z
Hi-Z
L
L
H
L
L
H
L
H
L
Read
Dout
Hi-Z
Dout
Dout
Dout
Hi-Z
L
H
L
L
L
H
L
H
L
Write
Din
X
Din
Din
Din
X
L
L
H
X
H
X
X
H
X
H
Output disable
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Remark
X
Hi-Z : High impedance
: Don’t Care
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