psd311-b-90ui STMicroelectronics, psd311-b-90ui Datasheet - Page 50

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

Figure 23. Timing of 8-Bit Multiplexed Address/Data Bus Using R/W E or R/W, DS
RD/E/DS as DS
Multiplexed
RD/E/DS as E
PA0-PA7 Pins
PAD Input
R/W as R/W
See referenced notes on page 64.
Active High
WR/V
as Address
Active Low
Inputs
as I/O Pin
as I/O Pin
PA0-PA7
PB0-PB7
Direct
CSI/A19
A0/AD0-
A7/AD7
Outputs
as CSI
Any of
Any of
Any of
PP
AS
AS
(1)
(2)
or
(PSD3X2/3X3)
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
PSD3XX Family
34
IN
OUTPUT
OUTPUT
47