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参数资料
型号： ADE7569ASTZF16
厂商： Analog Devices Inc
文件页数： 74/136页
文件大小： 0K
描述： IC ENERGY METER MCU 16K 64LQFP
标准包装： 1
输入阻抗： *
测量误差： *
电压 - 高输入/输出： *
电压 - 低输入/输出： *
电流 - 电源： *
电源电压： *
测量仪表类型： *
工作温度： *
安装类型： 表面贴装
封装/外壳： 64-LQFP
供应商设备封装： 64-LQFP（10x10）
包装： 托盘
ADE7566/ADE7569
Address 0x80 through Address 0xFF of general-purpose RAM
are shared with the special function registers. The mode of
addressing determines which memory space is accessed as
shown in Figure 70.
Preliminary Technical Data
The individual bits of some SFRs can be accessed for use in
Boolean and program-branching instructions. These SFRs are
labeled as bit-addressable and the bit addresses are given in the
SFR Mapping section.
0xFF
0x80
0x7F
0x00
ACCESSIBLE BY
INDIRECT ADDRESSING
ONLY
ACCESSIBLE BY
DIRECT AND INDIRECT
ADDRESSING
ACCESSIBLE BY
DIRECT ADDRESSING
ONLY
Extended Internal RAM (XRAM)
The ADE7566/ADE7569 provide 256 bytes of extended on-chip
RAM. No external RAM is supported. This RAM is located in
Address 0x0000 through Address 0x00FF in the extended RAM
space. To select the extended RAM memory space, the extended
GENERAL PURPOSE RAM
SPECIAL FUNCTION REGISTERS (SFRs)
Figure 70. General-Purpose RAM and SFR Memory Address Overlap
Both direct and indirect addressing can be used to access general-
purpose RAM from 0x00 through 0x7F. However, only indirect
addressing can be used to access general-purpose RAM from
0x80 through 0xFF because this address space shares the same
space with the special function registers (SFRs).
The 8052 core also has the means to access individual bits of
certain addresses in the general-purpose RAM and special
function memory spaces. The individual bits of general-purpose
RAM Address 0x20 to Address 0x2F can be accessed through
their Bit Address 0x00 through Bit Address 0x7F. The benefit of
bit addressing is that the individual bits can be accessed quickly
without the need for bit masking, which takes more code memory
and execution time. The bit addresses for general-purpose RAM
Address 0x20 through Address 0x2F can be seen in Figure 71.
indirect addressing modes are used. The internal XRAM is
enabled in the Configuration SFR (CFG, 0xAF) by writing 01 to
CFG[1:0].
0x00FF
256 BYTES OF
EXTENDED INTERNAL
RAM (XRAM)
0x0000
Figure 72. Extended Internal RAM (XRAM) Space
Code Memory
Code and data memory are stored in the 16 kB flash memory
space. No external code memory is supported. To access code
memory, code indirect addressing is used.
ADDRESSING MODES
The 8052 core provides several addressing modes. The
addressing mode determines how the core interprets the
memory location or data value specified in assembly language
code. There are six addressing modes as shown in Table 60.
BYTE
ADDRESS
0x2F
0x2E
0x2D
7F
77
6F
BIT ADDRESSES (HEXA)
7E 7D 7C 7B 7A 79
76 75 74 73 72 71
6E 6D 6C 6B 6A 69
78
70
68
Table 60. 8052 Addressing Modes
Addressing Mode Example
Bytes
Core Clock
Cycles
0x2C
0x2B
0x2A
0x29
0x28
0x27
0x26
0x25
0x24
0x23
0x22
0x21
0x20
67
5F
57
4F
47
3F
37
2F
27
1F
17
0F
07
66
5E
56
4E
46
3E
36
2E
26
1E
16
0E
06
65
5D
55
4D
45
3D
35
2D
25
1D
15
0D
05
64
5C
54
4C
44
3C
34
2C
24
1C
14
0C
04
63
5B
53
4B
43
3B
33
2B
23
1B
13
0B
03
62
5A
52
4A
42
3A
32
2A
22
1A
12
0A
02
61
59
51
49
41
39
31
29
21
19
11
09
01
60
58
50
48
40
38
30
28
20
18
10
08
00
Immediate
Direct
Indirect
Extended Direct
Extended Indirect
Code Indirect
MOV A, #A8h
MOV DPTR,#A8h
MOV A, A8h
MOV A, IE
MOV A, R0
MOV A,@R0
MOVX A, @DPTR
MOVX A, @R0
MOVC A, @A+DPTR
MOVC A, @A+PC
JMP @A+DPTR
2
3
2
2
1
1
1
1
1
1
1
2
3
2
2
1
2
4
4
4
4
3
Figure 71. Bit Addressable Area of General-Purpose RAM
Bit addressing can be used for instructions that involve Boolean
variable manipulation and program branching (see the
Instruction Set section).
Special Function Registers
Special function registers are registers that affect the function of
the 8051 core or its peripherals. These registers are located in
RAM in Address 0x80 through Address 0xFF. They are only
accessible through direct addressing as shown in Figure 70 .
Immediate Addressing
In immediate addressing, the expression entered after the
number sign (#) is evaluated by the assembler and stored in the
specified memory address. This number is referred to as a literal
because it refers only to a value and not to a memory location.
Instructions using this addressing mode is slower than those
between two registers because the literal must be stored and
fetched from memory. The expression can be entered as a
symbolic variable or an arithmetic expression; the value is
computed by the assembler.
Rev. PrA | Page 74 of 136
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