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ST7285C Datasheet(HTML) 82 Page - STMicroelectronics

Part No. ST7285C
Description  8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7285C Datasheet(HTML) 82 Page - STMicroelectronics

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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.
Lon g and Short
Indirect Indexed
Instructions
Function
LD
Load
CP
Compare
AND, OR, XOR
Logical Operations
ADC, ADD, SUB, SBC
Arithmetic Additions/Sub-
stractions operations
BCP
Bit Compare
Short Indirect Indexed
Instructions Only
Function
CLR
Clear
INC, DEC
Increment/Decrement
TNZ
Test Negative or Zero
CPL, NEG
1 or 2 Complement
BSET, BRES
Bit Operations
BTJT, BTJF
Bit Test and Jump Opera-
tions
SLL, SRL, SRA, RLC,
RRC
Shift and Rotate Opera-
tions
SWAP
Swap Nibbles
CALL, JP
Call or Jump subroutine
Available Relative
Direct/Indirect
Instructions
Function
JRxx
Conditional Jump
CALLR
Call Relative


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