psd311-b-90ui STMicroelectronics, psd311-b-90ui Datasheet - Page 62

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

Figure 35. Timing of 16-Bit Non-Multiplexed Address/Data Bus Using R/W, E or R/W, DS
RD/E/DS as DS
RD/E/DS as E
RD/E/DS as E
RD/E/DS as E
RD/E/DS as E
Multiplexed
PAD Input
See referenced notes on page 64.
R/W as R/W
BHE/PSEN
Active High
(High Byte)
Active Low
WR/V
as A0-A15
(Low Byte)
A15/AD15
Inputs
PA0-PA7
PB0-PB7
Direct
A0/AD0-
CSI/A19
as BHE
as CSI
PP
AS
AS
(PSD3X2/3X3)
(1)
(2)
or
1
2
3
35
STABLE INPUT
STABLE INPUT
7
5
6
33
6
READ CYCLE
4
8
12
DATA VALID
DATA VALID
9
32
32
10
13
34
1
2
36
STABLE INPUT
STABLE INPUT
14
WRITE CYCLE
3
15
35
14
33
32
32
12
16
17
13
DATA
DATA
PSD3XX Family
IN
IN
34
59