psd835g2 STMicroelectronics, psd835g2 Datasheet - Page 71

• Manufacturer Part Number: psd835g2
• Description: Configurable Memory System On A Chip For 8-bit Microcontrollers
• Manufacturer: STMicroelectronics

PSD835G2
Table 13.
1. The A16 and A17 connections are optional.
2. In non-Page-Mode, AD7-AD0 connects to ADIO7-ADIO0.
CRYSTAL
RESET
RESET
Interfacing the PSD with the 80C251, with one READ Input
10
21
20
35
2
3
4
5
6
7
8
9
U1
P1.0
P1.1
P1.2
P1.3
P1.5
P1.6
P1.7
X1
X2
RESET
EA
P1.4
80C31
RD/A16
PSEN
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
ALE
WR
RESET
18
43
42
41
40
39
38
37
36
24
25
26
27
28
29
30
31
19
32
33
RD
A17
A16
ALE
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
WR
A8
A9
A10
A11
A12
A13
A15
A14
39
16
77
78
10
11
12
15
17
18
71
72
73
74
75
76
13
14
19
20
40
59
60
79 PD0 (ALE)
80
3
4
5
6
7
1
2
PSD
ADIO0 (2)
ADIO1
ADIO3
ADIO4
ADIO5
ADIO6
ADIO7
PE6
PE7
ADIO2
PE0 (TMS)
PE1 (TCK/ST)
PE2 (TDI)
PE3 (TDO)
PE4 (TSTAT/RDY)
PE5 (TERR)
ADIO8
ADIO9
ADIO10
ADIO11
ADIO12
ADIO13
ADIO14
ADIO15
CNTL0 (WR)
CNTL1(RD)
CNTL2 (PSEN)
PD1 (CLKIN)
PD2 (CS)
PD3
RESET
GND GND GND GND GND
A17-A8
AD7-AD0
V CC
8
V CC
30
V CC
49
V CC
50
PF0
PF1
PF2
PF3
PF4
PF5
PF6
PF7
PG0
PG1
PG2
PG3
PG4
PG5
PG6
PG7
PA0
PA1
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
70
PA2
31
32
33
34
35
36
37
38
52
53
54
55
56
57
58
42
43
44
45
46
47
48
27
61
62
63
64
65
66
67
68
41
21
22
23
24
25
26
28
51
MCU bus interface
A16 (1)
A17
AD [ 7:0 ]
AD [15 :8 ]
AI02881e
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