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參數(shù)資料
| 型號： | ST90158M7 |
| 英文描述： | 8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
| 中文描述： | 16位產(chǎn)品微控制器（MCU），并配備16至64K的光盤。檢察官辦公室或EPROM。 512 2K的內(nèi)存- ST9家庭 |
| 文件頁數(shù)： | 23/199頁 |
| 文件大小： | 2813K |
| 代理商： | ST90158M7 |
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ST90158 - DEVICE ARCHITECTURE
SYSTEM REGISTERS
(Cont’d)
If the bit is set, data is accessed using the Data
Pointers (DPRs registers), otherwise it is pointed
to by the Code Pointer (CSR register); therefore,
the user initialization routine must include a
Sdm
instruction. Note that code is always pointed to by
the Code Pointer (CSR).
Note:
In the current ST9 devices, the DP flag is
only for compatibility with software developed for
the first generation of ST9 devices. With the single
memory addressing space, its use is now redun-
dant. It must be kept to 1 with a
Sdm
instruction at
the beginning of the program to ensure a normal
use of the different memory pointers.
2.3.3 Register Pointing Techniques
Two registers within the System register group,
are used as pointers to the working registers. Reg-
ister Pointer 0 (R232) may be used on its own as a
single pointer to a 16-register working space, or in
conjunction with Register Pointer 1 (R233), to
point to two separate 8-register spaces.
For the purpose of register pointing, the 16 register
groups of the register file are subdivided into 32 8-
register blocks. The values specified with the Set
Register Pointer instructions refer to the blocks to
be pointed to in twin 8-register mode, or to the low-
er 8-register block location in single 16-register
mode.
The Set Register Pointer instructions
srp
,
srp0
and
srp1
automatically inform the CPU whether
the Register File is to operate in single 16-register
mode or in twin 8-register mode. The
srp
instruc-
tion selects the single 16-register group mode and
specifies the location of the lower 8-register block,
while the
srp0
and
srp1
instructions automatical-
ly select the twin 8-register group mode and spec-
ify the locations of each 8-register block.
There is no limitation on the order or position of
these register groups, other than that they must
start on an 8-register boundary in twin 8-register
mode, or on a 16-register boundary in single 16-
register mode.
The block number should always be an even
number in single 16-register mode. The 16-regis-
ter group will always start at the block whose
number is the nearest even number equal to or
lower than the block number specified in the
srp
instruction. Avoid using odd block numbers, since
this can be confusing if twin mode is subsequently
selected.
Thus:
srp #3
will be interpreted as
srp #2
and will al-
low using R16 ..R31 as r0 .. r15.
In single 16-register mode, the working registers
are referred to as
r0
to
r15
. In twin 8-register
mode, registers
r0
to
r7
are in the block pointed
to by RP0 (by means of the
srp0
instruction),
while registers
r8
to
r15
are in the block pointed
to by RP1 (by means of the
srp1
instruction).
Caution
:
Group D registers can only be accessed
as working registers using the Register Pointers,
or by means of the Stack Pointers. They cannot be
addressed explicitly in the form “
Rxxx
”.
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST90158M7LVT6 | 8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
| ST90158M7T6 | 8-BIT MICROCONTROLLER |
| ST90158M9 | 8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
| ST90158M9LVT6 | 8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
| ST90158M9T6 | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST90158M7LVT6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
| ST90158M7Q6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM |
| ST90158M7T6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| ST90158M9 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
| ST90158M9LVT6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY |
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