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PSD813F2 bảng dữ liệu(PDF) 65 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Flash in-system programmable (ISP) peripherals for 8-bit MCUs, 5 V
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PSD813F2 bảng dữ liệu(HTML) 65 Page - STMicroelectronics

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PSD8XXFX
MCU bus interface
Doc ID 7833 Rev 7
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15.7
80C51XA
The Philips 80C51XA MCU family supports an 8- or 16-bit multiplexed bus that can have
burst cycles. Address bits (A3-A0) are not multiplexed, while (A19-A4) are multiplexed with
data bits (D15-D0) in 16-bit mode. In 8-bit mode, (A11-A4) are multiplexed with data bits
(D7-D0).
The 80C51XA can be configured to operate in eight-bit data mode (as shown in Figure 23).
The 80C51XA improves bus throughput and performance by executing burst cycles for code
fetches. In Burst mode, address A19-A4 are latched internally by the PSD, while the
80C51XA changes the A3-A0 signals to fetch up to 16 bytes of code. The PSD access time
is then measured from address A3-A0 valid to data in valid. The PSD bus timing
requirement in Burst mode is identical to the normal bus cycle, except the address setup
and hold time with respect to Address Strobe (ALE/AS, PD0) does not apply.
Figure 23.
Interfacing the PSD with the 80C51X, 8-bit data bus
ADIO0
ADIO1
ADIO2
ADIO3
AD104
AD105
ADIO6
ADIO7
ADIO8
ADIO9
ADIO10
ADIO11
AD1012
AD1013
ADIO14
ADIO15
CNTL0 (WR)
CNTL1(RD)
CNTL 2 (PSEN)
PD0-ALE
PD1
PD2
RESET
31
33
36
2
3
4
5
43
42
41
40
39
38
37
24
25
26
27
28
29
30
A4D0
A5D1
A6D2
A7D3
A8D4
A9D5
A10D6
A11D7
A12
A13
A14
A18
A19
A17
A15
A16
A0
A1
A2
A3
A4D0
A5D1
A6D2
A7D3
A8D4
A9D5
A10D6
A11D7
A12
A16
A17
A18
A19
A15
A13
A14
TXD1
T2EX
T2
T0
RST
EA/WAIT
BUSW
A1
A0/WRH
A2
A3
A4D0
A5D1
A6D2
A7D3
A8D4
A9D5
A10D6
A11D7
A12D8
A13D9
A14D10
A15D11
A16D12
A17D13
A18D14
A19D15
PSEN
RD
WRL
PC0
PC1
PC3
PC4
PC5
PC6
PC7
ALE
PSEN
RD
WR
ALE
32
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
7
9
8
16
XTAL1
XTAL2
RXD0
TXD0
RXD1
21
20
11
13
6
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
A0
A1
A2
A3
80C51XA
PSD
RESET
RESET
35
17
INT0
INT1
14
10
15
PC2
AI02883C



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