PSD312B-70J Datasheet, PDF (52/85 Pages) STMicroelectronics – Low Cost Field Programmable Microcontroller Peripherals

PSD3XX Family
Figure 25. Timing of 16-Bit Multiplexed Address/Data Bus Using RD, WR (PSD3X2/3X3)
CSI/A19
as CSI
Direct ⁽¹⁾
PAD Input
READ CYCLE
32
7
STABLE INPUT
6
WRITE CYCLE
32
15
32
STABLE INPUT
14
Multiplexed ⁽²⁾
Inputs
6
14
ct(s) ^BHE/PSEN
u as BHE
Prod _t(s) ^A0/AD0-
A15/AD15
lete duc ^{Active High}
so ^{ro ALE}
b ^P _{Active Low}
- ^{O te ALE}
t(s) ^{sole RD/E/DS as RD}
roduc ^{) - Ob WR/VPP or}
P _t(s ^{R/W as WR}
te ^c Any of
le ^{u PA0-PA7}
d _{as I/O Pin}
bso Pro _{Any of}
O _te ^PB0-PB7
as I/O Pin
ole_{Any of}
s_{PA0-PA7 Pins}
b _{as Address}
O Outputs
10
ADDRESS A
2
3
4
1
DATA VALID
9
8
5
13
12
18
19
INPUT
INPUT
23
ADDRESS A
ADDRESS B
2
3
1
11
DATA
IN
17
16
36
13
12A
20
OUTPUT
OUTPUT
23
ADDRESS B
See referenced notes on page 64.
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