參數(shù)資料
型號： HE84760B
廠商： King Billion Electronics Co., Ltd.
英文描述： 8-bit Micro-controller
中文描述： 8位微控制器
文件頁數(shù)： 11/51頁
文件大小： 487K
代理商： HE84760B
KING BILLION ELECTRONICS CO., LTD
駿
億
電
子
股
份
有
限
公
司
HE84760B
HE80004 Series
June 29, 2005
This specification is subject to change without notice. Please contact sales person for the latest version before use.
11
V1.0
VDD
VDD
VDD
A16
A15
A14
A13
A12
A11
A9
A8
WE
A17
A20
A19
A10
DQ7
DQ6
DQ5
DQ4
CS3
CS2
CS1
CS0
WE
OE
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
A19
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
Q0
Q1
Q2
A18
A17
A14
A13
A8
A9
A11
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
A10
CS0
Q7
Q6
Q5
Q4
Q3
A18
A7
A6
A5
A4
A3
A2
A1
DQ3
DQ2
DQ1
DQ0
OE
CE
A0
A19
A18
A8
A7
A6
A5
A4
A3
A2
A1
CS1
A20
A9
A10
A11
A12
A13
A14
A15
A16
A17
A11
A9
A8
A13
WE
A17
A15
OE
A10
CS3
DQ7
DQ6
DQ5
DQ4
DQ3
A18
A16
A14
A12
A7
A6
A5
A4
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ2
DQ1
DQ0
A0
A1
A2
A3
A0
Q7
D0
Q1
Q6
Q2
Q5
Q3
Q4
C89
0.1uF
M27C801
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
A19
A16
A15
A12
A7
A6
A5
A4
A3
A2
A1
A0
Q0
Q1
Q2
VSS
Q3
Q4
Q6
Q7
CE
OE/VPP
A11
A9
A8
A13
A17
A18
VCC
28F320-TSOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
A16
A15
A14
A13
A12
A11
A9
A8
WE
RP
VPP
WP
A18
A7
A6
A5
A4
A3
A2
A1
A0
GCE
OE
DQ0
DQ1
DQ2
NC
VCC
VCCQ
DQ4
DQ5
A10
A19
A20
A17
LP62S4096-TSOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
A11
A9
A8
A13
WE
A17
A15
VCC
A18
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
IO0
IO2
IO3
IO4
IO5
IO7
CS1
A10
OE
M27C160
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
A18
A17
A7
A6
A5
A4
A3
A2
A1
A0
CE
VSS
OE
Q0
Q8
Q1
Q9
Q2
Q10
Q3
Q11
VCC
Q4
Q5
Q13
Q6
Q14
Q15Q7
BVSS
A16
A15
A14
A12
A11
A10
A9
A8
Intel NOR FLASH
512KB x 8 SRAM
8 MB EPROM
16 MB EPROM
Ext. Bus Interface
7.
External RAM/Flash Memory
The external memory devices can be mask ROM, static RAM, or NOR type FLASH memory. Most NOR
type FLASH memory and RAM can be used as external storage for both program and data, so program
can be downloaded to external memory devices for future execution. However, there are some limitations.
When the data is to be written to external devices, the loader must reside in internal program space. In
other words, the loader program must be in internal ROM. When download is completed, the program in
the external memory can be run.
The data written to external memory devices is through a command interface composed of AC, EXMC
and EXMD registers for setting up the memory addresses, switching memory buses, generating read/write
pulse, read/write memory contents, etc. When writing finishes, external memory can be switched back the
external address and data bus for CPU to fetch data and instructions.
Writing to address registers is through a common register AC. Writing to AC will write data to ACL, ACH,
and then ACP in cyclic order. The sequence will be reset by an access to EXMD register. Therefore, it is
advisable to make a dummy read to EXMD register before writing to AC, so that the first write will be
made to ACL.
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