psd311-b-90ui STMicroelectronics, psd311-b-90ui Datasheet - Page 52
psd311-b-90ui
Manufacturer Part Number
psd311-b-90ui
Description
Low Cost Field Programmable Microcontroller Peripherals
Manufacturer
STMicroelectronics
Datasheet
1.PSD311-B-90UI.pdf
(85 pages)
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Figure 25. Timing of 16-Bit Multiplexed Address/Data Bus Using RD, WR (PSD3X2/3X3)
RD/E/DS as RD
See referenced notes on page 64.
Multiplexed
PA0-PA7 Pins
PAD Input
BHE/PSEN
WR/V
R/W as WR
Active High
as Address
Active Low
A15/AD15
Inputs
as I/O Pin
PB0-PB7
as I/O Pin
PA0-PA7
Direct
CSI/A19
as BHE
A0/AD0-
Outputs
Any of
as CSI
Any of
Any of
PP
ALE
ALE
(1)
(2)
or
1
23
2
ADDRESS A
3
STABLE INPUT
7
6
5
6
4
ADDRESS A
READ CYCLE
8
18
12
INPUT
INPUT
DATA VALID
9
32
10
19
13
23
1
2
ADDRESS B
STABLE INPUT
36
14
WRITE CYCLE
3
15
11
14
ADDRESS B
16
32
32
12A
17
13
20
DATA
PSD3XX Family
IN
OUTPUT
OUTPUT
49
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