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UPD17P136ACT Datasheet(PDF) 114 Page - NEC

Part # UPD17P136ACT
Description  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  292 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17P136ACT Datasheet(HTML) 114 Page - NEC

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CHAPTER 11 ARITHMETIC AND LOGIC UNIT (ALU)
95
11.5.2 FALSE (0) Bit Judgement
The FALSE (0) bit judgement instruction (SKF m, #n) is used to determine whether or not the bits specified by n
in the 4 bits of data memory m are FALSE (0). When all bits specified by n are FALSE (0), this instruction causes
the next instruction to be skipped.
Example
MOV
M1,
#1001B
;
SKF
M1,
#0110B
; (1)
BR
A
;
BR
B
;
SKF
M1,
#1110B
; (2)
BR
C
;
BR
D
;
In this example, bits 2 and 1 of data memory M1 are judged in step number (1). Because both bits
are FALSE (0), the program branches to B. In step number (2), bits 3, 2, and 1 of data memory M1
are judged. Since bit 3 of data memory M1 is TRUE (1), the program branches to C.



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