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参数资料
型号： PSD813F4-15JI
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 128K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQCC52
封装： PLASTIC, LCC-52
文件页数： 43/103页
文件大小： 1180K
代理商： PSD813F4-15JI
PSD8XXF2/3/4/5
44/103
The first configuration is 80C31-compatible, and
the bus interface to the PSD8XXFX is identical to
that shown in Figure 19. The second and third con-
figurations have the same bus connection as
shown in Figure 18. There is only one Read Strobe
(PSEN) connected to CNTL1 on the PSD8XXFX.
The A16 connection to PA0 allows for a larger ad-
dress input to the PSD8XXFX. The fourth configu-
ration is shown in Figure 20. 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 ad-
dress 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 PSD8XXFX 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.
Table 18. Interfacing the PSD8XXFX with the 80C251, with One READ Input
Note: 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
35
P3.4/T0
P3.5/T1
16
15
17
10
RESET
PC2
AI02881C
A171
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PSD813F5-12JI 制造商:WSI 功能描述:
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