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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 1138.87KB

  • 289頁

  • NEC   NEC

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CHAPTER 9
REGISTER FILE (RF)
(3) During use of the in-circuit emulator (IE-17K or IE-17K-ET) (operation during patch processing and
similar operations)
Attempting to write to a read-only register has no effect and no error is generated.
Attempting to read data from an address in the unused data area will yield an unpredictable value.
Attempting to write to an address in the unused data area has no effect and no error is generated.
9.4.2 Register File Symbol Definitions and Reserved Words
Attempting to use a numerical value in a 17K Series assembler (AS17K) to specify a register file address in the
rf operand of the PEEK WR, rf or POKE rf, WR instructions will cause an error to be generated.
Therefore, as shown in
Example 1,
register file addresses need to be defined beforehand as symbols.
Example 1.
Case which causes and error to be generated
PEEK
POKE
WR, 02H
21H, WR
;
;
Case in which no error is generated
RF71
MEM
PEEK
0.71H
WR, RF71
; Symbol definition
;
Caution should especially be taken with regard to the following point:
鈥?When using a symbol to define the control register as an address in data memory, it needs to be defined as
addresses 80H to BFH of BANK0.
Since the control register is manipulated using the window register, any attempt to manipulate the control register
other than by using the PEEK and POKE commands needs to cause an error to be generated in the assembler (AS17K).
However, note that any address in the area of the register file overlapping with data memory (address locations
40H to 7FH) can be defined as a symbol in the same manner as with normal data memory.
An example is given below.
Example 2.
RF71
RF02
MEM
MEM
PEEK
PEEK
0.71H
0.82H
WR, RF71
WR, RF02
; Address in register file overlapping with data memory
; Control register
; RF71 becomes address 71H
; RF02 becomes address 02H in the control register.
76

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