psd311-b-90ui STMicroelectronics, psd311-b-90ui Datasheet - Page 54

• Manufacturer Part Number: psd311-b-90ui
• Description: Low Cost Field Programmable Microcontroller Peripherals
• Manufacturer: STMicroelectronics

Figure 27. Timing of 16-Bit Multiplexed Address/Data Bus Using R/W, E or R/W, DS
RD/E/DS as DS
See referenced notes on page 64.
RD/E/DS as E
RD/E/DS as E
RD/E/DS as E
RD/E/DS as E
Multiplexed
PA0-PA7 Pins
PAD Input
R/W as R/W
BHE/PSEN
Active High
WR/V
as Address
Active Low
A15/AD15
Inputs
as I/O Pin
PB0-PB7
as I/O Pin
PA0-PA7
Direct
as BHE
A0/AD0-
CSI/A19
Outputs
as CSI
Any of
Any of
Any of
PP
AS
AS
(1)
(2)
or
(PSD3X2/3X3)
1
23
2
ADDRESS A
3
STABLE INPUT
35
7
6
33
5
6
ADDRESS A
READ CYCLE
4
18
8
12
INPUT
INPUT
DATA VALID
9
32
10
19
13
34
23
1
2
ADDRESS B
36
STABLE INPUT
35
14
WRITE CYCLE
3
15
14
33
ADDRESS B
16
32
32
12
17
13
34
20
DATA
PSD3XX Family
IN
OUTPUT
OUTPUT
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