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參數(shù)資料
| 型號(hào)： | ST92T141K4M6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, OTPROM, 25 MHz, MICROCONTROLLER, PDSO34 |
| 封裝： | PLASTIC, SO-34 |
| 文件頁(yè)數(shù)： | 95/179頁(yè) |
| 文件大?。?/td> | 1905K |
| 代理商： | ST92T141K4M6 |
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ST92141 - DEVICE ARCHITECTURE
MEMORY SPACES (Cont’d)
2.2.2 Register Addressing
Register File registers, including Group F paged
registers (but excluding Group D), may be ad-
dressed explicitly by means of a decimal, hexa-
decimal or binary address; thus R231, RE7h and
R11100111b
represent the same register (see
Figure 6). Group D registers can only be ad-
dressed in Working Register mode.
Note that an upper case “R” is used to denote this
direct addressing mode.
Working Registers
Certain types of instruction require that registers
be specified in the form “rx”, where x is in the
range 0 to 15: these are known as Working Regis-
ters.
Note that a lower case “r” is used to denote this in-
direct addressing mode.
Two addressing schemes are available: a single
group of 16 working registers, or two separately
mapped groups, each consisting of 8 working reg-
isters. These groups may be mapped starting at
any 8 or 16 byte boundary in the register file by
means of dedicated pointer registers. This tech-
nique is described in more detail in Section 2.3.3
Register Pointing Techniques, and illustrated in
Figure 7 and in Figure 8.
System Registers
The 16 registers in Group E (R224 to R239) are
System registers and may be addressed using any
of the register addressing modes. These registers
are described in greater detail in Section 2.3 SYS-
TEM REGISTERS.
Paged Registers
Up to 64 pages, each containing 16 registers, may
be mapped to Group F. These are addressed us-
ing any register addressing mode, in conjunction
with the Page Pointer register, R234, which is one
of the System registers. This register selects the
page to be mapped to Group F and, once set,
does not need to be changed if two or more regis-
ters on the same page are to be addressed in suc-
cession.
Therefore if the Page Pointer, R234, is set to 5, the
instructions:
spp #5
ld R242, r4
will load the contents of working register r4 into the
third register of page 5 (R242).
These paged registers hold data and control infor-
mation relating to the on-chip peripherals, each
peripheral always being associated with the same
pages and registers to ensure code compatibility
between ST9 devices. The number of these regis-
ters therefore depends on the peripherals which
are present in the specific ST9 family device. In
other words, pages only exist if the relevant pe-
ripheral is present.
Table 9. Register File Organization
Hex.
Address
Decimal
Address
Function
Register
File Group
F0-FF
240-255
Paged
Registers
Group F
E0-EF
224-239
System
Registers
Group E
D0-DF
208-223
General
Purpose
Registers
Group D
C0-CF
192-207
Group C
B0-BF
176-191
Group B
A0-AF
160-175
Group A
90-9F
144-159
Group 9
80-8F
128-143
Group 8
70-7F
112-127
Group 7
60-6F
96-111
Group 6
50-5F
80-95
Group 5
40-4F
64-79
Group 4
30-3F
48-63
Group 3
20-2F
32-47
Group 2
10-1F
16-31
Group 1
00-0F
00-15
Group 0
1
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