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型号： AT89C51AC3-RLTIM
厂商： Atmel
文件页数： 102/140页
文件大小： 0K
描述： IC 8051 MCU FLASH 64K 44VQFP
标准包装： 160
系列： 89C
核心处理器： 8051
芯体尺寸： 8-位
速度： 60MHz
连通性： UART/USART
外围设备： POR，PWM，WDT
输入/输出数： 36
程序存储器容量： 64KB（64K x 8）
程序存储器类型： 闪存
EEPROM 大小： 2K x 8
RAM 容量： 2.25K x 8
电压 - 电源 (Vcc/Vdd)： 3 V ~ 5.5 V
数据转换器： A/D 8x10b
振荡器型： 外部
工作温度： -40°C ~ 85°C
封装/外壳： 44-LQFP
包装： 托盘
dsPIC33FJXXXGPX06/X08/X10
DS70286C-page 62
2009 Microchip Technology Inc.
TABLE 4-35:
FUNDAMENTAL ADDRESSING MODES SUPPORTED
4.3.3
MOVE AND ACCUMULATOR
INSTRUCTIONS
Move instructions and the DSP accumulator class of
instructions provide a greater degree of addressing
flexibility than other instructions. In addition to the
Addressing
modes
supported
by
most
MCU
instructions, move and accumulator instructions also
support Register Indirect with Register Offset
Addressing mode, also referred to as Register Indexed
mode.
In summary, the following Addressing modes are
supported by move and accumulator instructions:
Register Direct
Register Indirect
Register Indirect Post-modified
Register Indirect Pre-modified
Register Indirect with Register Offset (Indexed)
Register Indirect with Literal Offset
8-bit Literal
16-bit Literal
4.3.4
MAC
INSTRUCTIONS
The dual source operand DSP instructions (CLR, ED,
EDAC
, MAC, MPY, MPY.N, MOVSAC and MSC), also referred
to as MAC instructions, utilize a simplified set of
addressing modes to allow the user to effectively
manipulate the data pointers through register indirect
tables.
The 2-source operand prefetch registers must be
members of the set {W8, W9, W10, W11}. For data
reads, W8 and W9 are always directed to the X RAGU
and W10 and W11 will always be directed to the Y
AGU. The effective addresses generated (before and
after modification) must, therefore, be valid addresses
within X data space for W8 and W9 and Y data space
for W10 and W11.
In summary, the following addressing modes are
supported by the MAC class of instructions:
Register Indirect
Register Indirect Post-Modified by 2
Register Indirect Post-Modified by 4
Register Indirect Post-Modified by 6
Register Indirect with Register Offset (Indexed)
4.3.5
OTHER INSTRUCTIONS
Besides the various addressing modes outlined above,
some instructions use literal constants of various sizes.
For example, BRA (branch) instructions use 16-bit signed
literals to specify the branch destination directly, whereas
the DISI instruction uses a 14-bit unsigned literal field. In
some instructions, such as ADD Acc, the source of an
operand or result is implied by the opcode itself. Certain
operations, such as NOP, do not have any operands.
4.4
Modulo Addressing
Modulo Addressing mode is a method of providing an
automated means to support circular data buffers using
hardware. The objective is to remove the need for
software to perform data address boundary checks
when executing tightly looped code, as is typical in
many DSP algorithms.
Modulo Addressing can operate in either data or program
space (since the data pointer mechanism is essentially
the same for both). One circular buffer can be supported
in each of the X (which also provides the pointers into
program space) and Y data spaces. Modulo Addressing
Addressing Mode
Description
File Register Direct
The address of the file register is specified explicitly.
Register Direct
The contents of a register are accessed directly.
Register Indirect
The contents of Wn forms the EA.
Register Indirect Post-Modified
The contents of Wn forms the EA. Wn is post-modified (incremented or
decremented) by a constant value.
Register Indirect Pre-Modified
Wn is pre-modified (incremented or decremented) by a signed constant value
to form the EA.
Register Indirect with Register Offset The sum of Wn and Wb forms the EA.
Register Indirect with Literal Offset
The sum of Wn and a literal forms the EA.
Note:
For the MOV instructions, the Addressing
mode specified in the instruction can differ
for the source and destination EA.
However, the 4-bit Wb (Register Offset)
field is shared between both source and
destination (but typically only used by
one).
Note:
Not all instructions support all the
Addressing modes given above. Individual
instructions may support different subsets
of these Addressing modes.
Note:
Register Indirect with Register Offset
Addressing mode is only available for W9
(in X space) and W11 (in Y space).
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