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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁(yè)

  • NEC   NEC

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CHAPTER 7
SYSTEM REGISTER (SYSREG)
7.7.3 Index Enable Flag (IXE)
The IXE flag is used to enable to modify index of the data memory address, whether index modification is to be
performed on the data memory address used.
For a more detailed explanation, refer to
7.5 INDEX REGISTER (IX) AND DATA MEMORY ROW ADDRESS
POINTER (MEMORY POINTER: MP).
7.7.4 Zero Flag (Z) and Compare Flag (CMP)
The Z flag indicates whether the result of an arithmetic operation is 0. The CMP flag is used to specify that the
result of an arithmetic operation not be stored in data memory or the general register.
Table 7-2 shows how the CMP flag affects the setting and resetting of the Z flag.
Table 7-2. Zero Flag (Z) and Compare Flag (CMP)
Condition
When the result of the arithmatical operation is 0
When CMP=0
Z
鈫?/div>
1
When CMP=1
Z remains unchanged
Z
鈫?/div>
0
When the result of the arithmetic operation is other than 0 Z
鈫?/div>
0
The Z and CMP flags are used to compare the contents of the general register with those of the data memory.
The Z flag does not change other than in arithmetic operations; the CMP flag does not change other than in bit
decisions.
Example of 12-bit data comparision
;
Is the 12-bit data stored in M001, M002, and M003 equivalent to 456H?
SET2
SUB
SUB
SUB
; CLR1
SKT
BR
BR
CMP, Z
M001, #4
M002, #5
M003, #6
CMP
Z
DIFFER
AGREE
; CMP is automatically cleared by the bit decision instruction
;
鈮?/div>
456H
; =456H
; Data stored in M001, M002, and M003 are not
; damaged
;
CMP456:
63

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