D17133CS datasheet(7/289 Pages) NEC

7 / 289 page

– ii –

5.1.5

General Data Memory .........................................................................................................

5.1.6

Uninstalled Data Memory ...................................................................................................

CHAPTER 6

STACK ........................................................................................................................

6.1

STACK CONFIGURATION ................................................................................................

6.2

FUNCTIONS OF THE STACK ...........................................................................................

6.3

ADDRESS STACK REGISTER ..........................................................................................

6.4

INTERRUPT STACK REGISTER .......................................................................................

6.5

STACK POINTER (SP) AND INTERRUPT STACK REGISTER .......................................

6.6

STACK OPERATION DURING SUBROUTINES, TABLE REFERENCES,

AND INTERRUPTS ............................................................................................................

6.6.1

Stack Operation during Subroutine Calls (CALL) and Returns (RET, RETSK) ..................

6.6.2

Stack Operation during Table Reference (MOVT DBF, @AR) ...........................................

6.6.3

Executing RETI Instruction ..................................................................................................

6.7

STACK NESTING LEVELS AND THE PUSH AND POP INSTRUCTIONS ...................

CHAPTER 7 SYSTEM REGISTER (SYSREG) .................................................................................

7.1

SYSTEM REGISTER CONFIGURATION ..........................................................................

7.2

ADDRESS REGISTER (AR) ...............................................................................................

7.2.1

Address Register Configuration ..........................................................................................

7.2.2

Address Register Functions ................................................................................................

7.3

WINDOW REGISTER (WR) ...............................................................................................

7.3.1

Window Register Configuration ..........................................................................................

7.3.2

Window Register Functions ................................................................................................

7.4

BANK REGISTER (BANK) .................................................................................................

7.5

INDEX REGISTER (IX) AND DATA MEMORY ROW ADDRESS POINTER

(Memory Pointer: MP) ....................................................................................................

7.5.1

Index Register (IX) ...............................................................................................................

7.5.2

Data Memory Row Address Pointer (Memory Pointer: MP) ...........................................

7.5.3

MPE=0 and IXE=0 (No Data Memory Modification) .........................................................

7.5.4

MPE=1 and IXE=0 (Diagonal Indirect Data Transfer) ........................................................

7.5.5

MPE=0 and IXE=1 (Index Modification) .............................................................................

7.6

GENERAL REGISTER POINTER (RP) ..............................................................................

7.6.1

General Register Pointer Configuration ..............................................................................

7.6.2

Functions of the General Register Pointer .........................................................................

7.7

PROGRAM STATUS WORD (PSWORD) ........................................................................

7.7.1

Program Status Word Configuration ..................................................................................

7.7.2

Functions of the Program Status Word .............................................................................

7.7.3

Index Enable Flag (IXE) .......................................................................................................

7.7.4

Zero Flag (Z) and Compare Flag (CMP) ..............................................................................

7.7.5

Carry Flag (CY) .....................................................................................................................

7.7.6

Binary-Coded Decimal Flag (BCD) ......................................................................................

7.7.7

Caution on Use of Arithmetic Operations on the Program Status Word .........................

7.8

CAUTIONS ON USE OF THE SYSTEM REGISTER .......................................................

7.8.1

Reserved Words for Use with the System Register .........................................................

7.8.2

Handling of System Register Addresses Fixed at 0 ..........................................................

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