参数资料
型号: PSD813F1A-12JT
厂商: 意法半导体
英文描述: Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V
中文描述: Flash在系统可编程(ISP)的周边8位MCU,5V的
文件页数: 48/110页
文件大小: 1685K
代理商: PSD813F1A-12JT
PSD813F1
48/110
80C251
The Intel 80C251 MCU features a user-config-
urable bus interface with four possible bus config-
urations, as shown in
Table 18., page 49
.
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 ALE is active in every bus cycle.
In Page Mode, data D[7:0] is multiplexed with ad-
dress A[15:8]. In a bus cycle where there is a Page
hit, the ALE signal is not active and only addresses
A[7:0] are changing. The PSD supports both
modes. In Page Mode, the PSD bus timing is iden-
tical to Non-Page Mode except the address hold
time and setup time with respect to ALE is not re-
quired. The PSD access time is measured from
address A[7:0] valid to data in valid.
Table 17. Interfacing the PSD 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)
CNTL2(PSEN)
PD0-ALE
PD1
PD2
RESET
32
26
27
28
29
30
31
43
42
41
40
39
38
37
36
24
25
33
A0
A1
A2
A3
A4
A5
A6
A7
AD8
AD9
AD10
AD11
AD12
AD14
AD15
AD13
A0
A1
A2
A3
A4
A5
A6
A7
AD8
AD9
AD10
AD11
AD12
AD13
AD15
ALE
RD
WR
A16
AD14
14
15
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
P3.3/INT1
P3.4/T0
P3.5/T1
X2
X1
RST
EA
A161
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P0.0
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
ALE
PSEN
WR
RD/A16
PC0
PC1
PC2
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
16
17
10
RESET
AI02881C
A171
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