psd311-b-90ui STMicroelectronics, psd311-b-90ui Datasheet - Page 47
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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18.9 Timing Diagrams for all PSD3XX Parts
Figure 20. Timing of 8-Bit Multiplexed Address/Data Bus Using RD, WR (PSD3X1)
44
PSD3XX Family
Multiplexed
PA0-PA7 Pins
PAD Input
RD/E as RD
See referenced notes on page 64.
BHE/PSEN
Active High
RW as WR
as Address
Active Low
WR/V
Inputs
as I/O Pin
as I/O Pin
as PSEN
PA0-PA7
PB0-PB7
Direct
A0/AD0-
CSI/A19
A7/AD7
Outputs
as CSI
Any of
Any of
Any of
PP
ALE
ALE
(1)
(2)
or
1
23
2
ADDRESS A
5
3
STABLE INPUT
7
6
6
4
ADDRESS A
READ CYCLE
8
18
12
INPUT
INPUT
DATA VALID
9
32
19
10
13
23
1
2
ADDRESS B
STABLE INPUT
36
14
WRITE CYCLE
11
3
15
14
ADDRESS B
16
32
32
12A
17
13
20
DATA
IN
OUTPUT
OUTPUT
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