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PSD834210MIT 数据表(PDF) 42 Page - STMicroelectronics

部件名 PSD834210MIT
功能描述  Flash PSD, 3.3V Supply, for 8-bit MCUs 2 Mbit 256 Kbit Dual Flash Memories and 64 Kbit SRAM
PDF  89 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PSD834210MIT 数据表(HTML) 42 Page - STMicroelectronics

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Figure 20. Interfacing the PSD with the 80C251, with RD and PSEN Inputs
80C51XA. The Philips 80C51XA MCU family sup-
ports an 8- or 16-bit multiplexed bus that can have
burst cycles. Address bits (A3-A0) are not multi-
plexed, 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 21).
The 80C51XA improves bus throughput and per-
formance by executing burst cycles for code fetch-
es. 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 ad-
dress 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.
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
PSEN
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
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
AI02882C



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