psd311-b-90ui STMicroelectronics, psd311-b-90ui Datasheet - Page 49

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

Figure 22. Timing of 8-Bit Multiplexed Address/Data Bus Using R/W, E or R/W, DS (PSD3X1)
46
PSD3XX Family
Multiplexed
PA0-PA7 Pins
PAD Input
R/W as R/W
Active High
as Address
WR/V
Active Low
See referenced notes on page 64.
RD/E as E
Inputs
as I/O Pin
as I/O Pin
PA0-PA7
PB0-PB7
CSI/A19
Direct
A0/AD0-
A7/AD7
Outputs
as CSI
Any of
Any of
Any of
PP
AS
AS
(1)
(2)
or
1
23
2
ADDRESS A
35
3
STABLE INPUT
5
7
6
33
6
ADDRESS A
READ CYCLE
4
18
12
8
INPUT
INPUT
DATA VALID
9
32
19
10
13
34
23
1
2
ADDRESS B
36
STABLE INPUT
14
WRITE CYCLE
3
15
35
14
33
ADDRESS B
16
32
32
12
17
13
20
DATA
34
IN
OUTPUT
OUTPUT