ZPSD211R-B-15J STMICROELECTRONICS [STMicroelectronics], ZPSD211R-B-15J Datasheet - Page 39

• Manufacturer Part Number: ZPSD211R-B-15J
• Description: Low Cost Field Programmable Microcontroller Peripherals
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

36
PSD211R Family
18.9 Timing Diagrams for all PSD211R Parts
Figure 19. Timing using RD and WR signals
See referenced notes on page 38.
Multiplexed
PA0-PA7 Pins
PAD Input
RD/E as RD
Active High
as Address
RW as WR
Active Low
WR/V
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
PSEN
Any of
Any of
PP
ALE
ALE
(1)
(2)
or
1
23
2
ADDRESS A
5
3
STABLE INPUT
7
6
6
4
ADDRESS A
READ CYCLE
8
18
12
INPUT
INPUT
DATA VALID
9
32
19
10
13
23
1
2
ADDRESS B
STABLE INPUT
36
14
WRITE CYCLE
11
3
15
14
ADDRESS B
16
32
32
12A
17
13
20
DATA
IN
OUTPUT
OUTPUT