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PSD813F2 数据表(PDF) 63 Page - STMicroelectronics

部件名 PSD813F2
功能描述  Flash in-system programmable (ISP) peripherals
PDF  128 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PSD813F2 数据表(HTML) 63 Page - STMicroelectronics

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PSD8XXFX
MCU bus interface
Doc ID 7833 Rev 7
63/128
15.6
80C251
The Intel 80C251 MCU features a user-configurable bus interface with four possible bus
configurations, as shown in Table 19.
The first configuration is 80C31-compatible, and the bus interface to the PSD is identical to
that shown in Figure 20. The second and third configurations have the same bus connection
as shown in Figure 21. There is only one Read Strobe (PSEN) connected to CNTL1 on the
PSD. The A16 connection to PA0 allows for a larger address input to the PSD. The fourth
configuration is shown in Figure 22. Read Strobe (RD) is connected to CNTL1 and Program
Select Enable (PSEN) is connected to CNTL2.
The 80C251 has two major operating modes: Page mode and Non-page mode. In Non-
page mode, the data is multiplexed with the lower address byte, and Address Strobe
(ALE/AS, PD0) is active in every bus cycle. In Page mode, data (D7-D0) is multiplexed with
address (A15-A8). In a bus cycle where there is a Page hit, Address Strobe (ALE/AS, PD0)
is not active and only addresses (A7-A0) are changing. The PSD supports both modes. In
Page mode, the PSD bus timing is identical to Non-Page mode except the address hold time
and setup time with respect to Address Strobe (ALE/AS, PD0) is not required. The PSD
access time is measured from address (A7-A0) valid to data in valid.
Figure 21.
Interfacing the PSD with the 80C251, with One READ input
1.
The A16 and A17 connections are optional.
2.
In non-Page-mode, AD7-AD0 connects to ADIO7-ADIO0.
ADIO0
ADIO1
ADIO2
ADIO3
ADIO4
ADIO5
ADIO6
ADIO7
ADIO8
ADIO9
ADIO10
ADIO11
ADIO12
ADIO13
ADIO14
ADIO15
CNTL0 (WR)
CNTL1(RD)
CNTL 2(PSEN)
PD0- ALE
PD1
PD2
RESET
32
26
43
42
41
40
39
38
37
36
24
25
27
28
29
30
31
33
A0
A1
A2
A3
A4
A5
A6
A7
AD8
AD9
AD10
AD14
AD15
AD13
AD11
AD12
A0
A1
A2
A3
A4
A5
A6
A7
AD8
AD9
AD10
AD11
AD15
ALE
WR
A16
RD
AD14
AD12
AD13
14
9
2
3
4
5
6
7
8
21
20
11
13
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P3.0/RXD
P3.1/TXD
P3.2/INT0
X2
X1
P3.3/INT1
RST
EA
A161
P0.1
P0.0
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
PSEN
WR
RD/A16
PC0
PC1
PC3
PC4
PC5
PC6
PC7
19
18
30
31
32
33
34
35
36
37
39
40
41
42
43
44
45
46
48
8
9
10
49
50
47
29
28
27
25
24
23
22
21
20
19
18
17
14
13
12
11
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
7
6
5
4
3
2
52
51
80C251SB
PSD
RESET
RESET
35
P3.4/T0
P3.5/T1
16
15
17
10
RESET
PC2
AI02881C
A171
Obsolete
Product(s)
- Obsolete
Product(s)



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