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PSD835G2 View Datasheet(PDF) - STMicroelectronics
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Description
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PSD835G2
Configurable Memory System on a Chip for 8-Bit Microcontrollers
STMicroelectronics
PSD835G2 Datasheet PDF : 110 Pages
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PSD8XX Family
Figure 20. Interfacing the PSD835G2 to the 80C251, with One Read Input
A17
V
CC
PSD835G2
A[17:8]
AD[7:0]
CRYSTAL
RESET
U1
2
3
4
5
6
7
8
9
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
21
X1
20
X2
11
13
14
15
16
17
P3.0/RXD
P3.1/TXD
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
10
RESET
35
EA
80C251SB
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
43
42
41
40
39
38
37
36
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
24
25
26
27
28
29
30
31
WR
18
RD/A16
19 A16
PSEN
32
ALE
33
RESET
RESET
**Connection
is optional.
**Non-page mode: AD[7:0] - ADIO[7:0].
A0
A1
A2
A3
A4
A5
A6
A7
AD8
AD9
AD10
AD11
AD12
AD13
AD14
AD15
3
4
5
ADIO0
* *
ADIO1
ADIO2
6
7
10
ADIO3
ADIO4
ADIO5
11
12
ADIO6
ADIO7
13
14
15
16
17
18
19
20
ADIO8
ADIO9
ADIO10
ADIO11
ADIO12
ADIO13
ADIO14
ADIO15
9 29 69
V
CC
V
CC
V
CC
WR
59
60
CNTL0 (WR)
CNTL1 (RD)
RD
40
CNTL2 (PSEN)
ALE
79
80
1
2
PD0 (ALE)
PD1 (CLKIN)
PD2 (CSI)
PD3
RESET
39
RESET
71
72
73
74
75
76
77
78
PE0 (TMS)
PE1 (TCK/ST)
PE2 (TDI)
PE3 (TDO)
PE4 (TSTAT/RDY)
PE5 (TERR)
PE6 (VSTBY)
PE7 (VBATON)
PF0
PF1
PF2
PF3
PF4
PF5
PF6
PF7
31
32
33
34
35
36
37
38
PG0
PG1
PG2
PG3
PG4
PG5
PG6
PG7
21
22
23
24
25
26
27
28
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
51
52
53
54
55
56
57
58
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
61
62
63
64
65
66
67
68
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
41
42
43
44
45
46
47
48
A16
*
A17
GND GND GND GND GND
PSD835G2
8 30 49 50 70
A[15:8]
AD[7:0]
48
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