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參數(shù)資料
| 型號： | MTA81010S-LPI/SO |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28 |
| 封裝： | 0.300 INCH, SOIC-28 |
| 文件頁數(shù)： | 3/76頁 |
| 文件大?。?/td> | 745K |
| 代理商： | MTA81010S-LPI/SO |
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1995 Microchip Technology Inc.
DS39005D-page 11
MTA81010
3.2
Memory Organization
3.2.1
PROGRAM MEMORY ORGANIZATION
Up to 512 words of 12-bit wide on-chip program
memory (EPROM/ROM) can be directly addressed.
Larger program memories can be addressed by
selecting one of up to four available pages of 512
words each (Figure 3-7). Sequencing of instructions is
controlled via the Program Counter (PC) which
automatically increments to execute in-line programs.
Program control operations supporting direct, indirect,
and relative addressing modes, can be performed by
bit test and skip instructions, call instructions, jump
instructions or by loading computed addresses into the
PC. In addition, an on-chip two-level stack is employed
to provide easy to use subroutine nesting.
3.2.2
DATA MEMORY ORGANIZATION
The 8-bit
data bus connects two basic functional
elements together: the Register File composed of up to
80 addressable 8-bit registers including the I/O Ports,
and an 8-bit wide Arithmetic Logic Unit. 32 bytes of
RAM are directly addressable while a “banking”
scheme, with banks of 16 bytes each, is employed to
address larger data memories (Figure 3-8). Data can
be addressed directly, or indirectly using the file select
register. Immediate data addressing is supported by
special “l(fā)iteral” instructions which load data from
program memory into the W register.
The register file is divided into two functional groups:
Special Function
registers and General Purpose
registers. The special function registers include the
Timer0 (TMR0) register, the Program Counter (PC), the
Status Register, the I/O registers (ports), and the File
Select Register (FSR). The general purpose registers
are used for data and
cont
rol
information u
nder
command of the instructions.
In addition, special purpose registers
are used to
control the I/O port configuration and prescaler options.
3.2.2.1
GENERAL PURPOSE REGISTER FILE
The register file is accessed either directly or indirectly
through the file select register FSR (Section 3.2.5).
3.2.2.2
SPECIAL FUNCTION REGISTERS
The Special Function Registers are registers used by
the CPU and peripheral functions to control
the
operation of the device (Table 3-3).
The special registers can be classified into two sets.
The special registers associated with the “core”
functions are described in this section. Those related
to the operation of the peripheral features are
described in the section for each peripheral feature.
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| MTA81010-LPI/P | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP28 |
| MTA81010S-RCI/SO | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28 |
| MTA81010-XTI/P | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP28 |
| MTA81010T-XT/SO | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28 |
| MTA81010S-XTI/SO | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28 |
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