参数资料
型号: ST7285C
厂商: 意法半导体
英文描述: 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
中文描述: 8位微控制器48,000铁路发展策略光盘,3K内存,ADC,两个定时器,2个SPI,I2C和脊髓损伤接口
文件页数: 82/117页
文件大小: 748K
代理商: ST7285C
82/117
ST7285C
ST7 ADDRESSING MODES
(Cont’d)
Indirect Indexed (short, long):
This is a combination of indirect and short indexed
addressing mode. The required data byte to do the
operation is found by its memory address, which is
defined by the unsigned addition of an index regis-
ter value (X or Y) with a pointer value located in
memory. The pointer address follows the op-code.
The indirect indexed addressing mode consists of
two sub-modes:
Indirect Indexed (short):
The pointer address is a byte, the pointer size is a
byte, thus allowing 00 - 1FE addressing space,
and requires 1 byte after the op-code.
Indirect Indexed (long):
The pointer address is a byte, the pointer size is a
word, thus allowing 64Kb addressing space, and
requires 1 byte after the op-code.
Relative mode (direct, indirect):
This addressing mode is used to modify the PC
register value, by adding an 8 bit signed offset to it.
The relative addressing mode consists of two sub-
modes:
Relative (direct):
The offset is following the op-code.
Relative (indirect):
The offset is defined in memory, which address
follows the op-code.
Long and Short
Indirect Indexed
Instructions
Function
LD
CP
AND, OR, XOR
Load
Compare
Logical Operations
Arithmetic Additions/Sub-
stractions operations
Bit Compare
ADC, ADD, SUB, SBC
BCP
Short Indirect Indexed
Instructions Only
CLR
INC, DEC
TNZ
CPL, NEG
BSET, BRES
Function
Clear
Increment/Decrement
Test Negative or Zero
1 or 2 Complement
Bit Operations
Bit Test and Jump Opera-
tions
Shift and Rotate Opera-
tions
Swap Nibbles
Call or Jump subroutine
BTJT, BTJF
SLL, SRL, SRA, RLC,
RRC
SWAP
CALL, JP
Available Relative
Direct/Indirect
Instructions
JRxx
CALLR
Function
Conditional Jump
Call Relative
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