psd813f3 STMicroelectronics, psd813f3 Datasheet - Page 46

• Manufacturer Part Number: psd813f3
• Description: Flash In-system Programmable Isp Peripherals For 8-bit Mcus
• Manufacturer: STMicroelectronics

PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2
80C31
Figure
which has an 8-bit multiplexed address/data bus.
The lower address byte is multiplexed with the
data bus. The MCU control signals Program Se-
lect Enable (PSEN, CNTL2), Read Strobe (RD,
Figure 21. Interfacing the PSD with an 80C31
46/110
RESET
RESET
21
shows the bus interface for the 80C31,
15
12
13
14
19
18
31
2
3
4
5
6
7
8
9
1
80C31
EA/VP
X1
X2
RESET
INT0
INT1
T0
T1
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
ALE/P
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
RXD
TXD
WR
RD
RESET
17
16
11
10
39
38
37
36
35
34
33
32
21
22
23
24
25
26
27
28
29
30
RD
PSEN
A8
A9
A10
A11
A12
A13
A15
WR
ALE
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
A14
CNTL1), and Write Strobe (WR, CNTL0) may be
used for accessing the internal memory and I/O
Ports blocks. Address Strobe (ALE/AS, PD0)
latches the address.
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
30
31
32
33
34
35
36
37
42
39
40
41
43
44
45
46
47
50
49
10
48
8
9
PSD
ADIO0
ADIO1
ADIO2
ADIO3
ADIO4
ADIO5
ADIO6
ADIO7
ADIO8
ADIO9
ADIO10
ADIO11
ADIO12
ADIO13
ADIO14
ADIO15
CNTL0 (WR)
CNTL1(RD)
CNTL2 (PSEN)
PD0-ALE
PD1
PD2
RESET
AD7-AD0
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
29
28
27
25
24
23
22
21
52
19
18
17
14
13
12
11
7
6
5
4
3
2
51
20
AD [ 7:0 ]
AI02880C