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FS98O02B-PCE Datasheet(PDF) 45 Page - Fortune Semiconductor Corp. |
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FS98O02B-PCE Datasheet(HTML) 45 Page - Fortune Semiconductor Corp. |
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45 / 50 page  FS98O02 Rev.1.5 45/50 Description Reset the content of memory address f Cycle 1 Example: CLRF WORK Before instruction: WORK = 5Ah After instruction: WORK = 00h CLRWDT Clear watch dog timer Syntax CLRWDT Operation Watch dog timer counter will be reset Flag Affected None Description CLRWDT instruction will reset watch dog timer counter. Cycle 1 Example: CLRWDT After instruction: WDT = 0 COMF Complement f Syntax COMF f, d 0 ≤ f ≤ 255 d ∈ [0,1] Operation [f] ← NOT([f]) Flag Affected Z Description [f] is complemented. If d is 0, the result is stored in the W register. If d is 1, the result is stored back in [f] Cycle 1 Example 1: COMF OPERAND,0 Before instruction: W = 88h, OPERAND = 23h After instruction: W = DCh, OPERAND = 23h Example 2: COMF OPERAND,1 Before instruction: W = 88h, OPERAND = 23h After instruction: W = 88h, OPERAND = DCh DECF Decrement f Syntax DECF f, d 0 ≤ f ≤ 255 d ∈ [0,1] Operation [Destination] ← [f] -1 Flag Affected Z Description [f] is decremented. If d is 0, the result is stored in the W register. If d is 1, the result is stored back in [f]. Cycle 1 Example 1: DECF OPERAND,0 Before instruction: W = 88h, OPERAND = 23h After instruction: W = 22h, OPERAND = 23h Example 2: DECF OPERAND,1 Before instruction: W = 88h, OPERAND = 23h After instruction: W = 88h, OPERAND = 22h DECFSZ Decrement f, skip if zero Syntax DECFSZ f, d 0 ≤ f ≤ FFh d ∈ [0,1] Operation [Destination] ← [f] -1, skip if the result is zero Flag Affected None Description [f] is decremented. If d is 0, the result is stored in the W register. If d is 1, the result is stored back in [f]. If the result is 0, then the next fetched instruction is discarded and a NOP is executed instead making it a two-cycle instruction. Cycle 1, 2 Example: Node DECFSZ FLAG, 1 OP1 : OP2 : Before instruction: PC = address (Node) After instruction: [FLAG] = [FLAG] - 1 If [FLAG] = 0 PC = address(OP1) If [FLAG] ≠ 0 PC = address(OP2) GOTO Unconditional Branch Syntax GOTO k 0 ≤ k ≤ 1FFFh Operation PC ← k Flag Affected None Description The immediate address is loaded into PC. Cycle 2 Example: GOTO THERE After instruction: PC = address (THERE) HALT Stop CPU Core Clock Syntax HALT Operation CPU Stop |
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