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FM8P54/56
Rev1.21 May 31, 2005
P.8/FM8P54/56
FEELING
TECHNOLOGY
FIGURE 2.2: Loading of PC in Different Situations
Situation 1: GOTO Instruction
PCH
PCL
9 8 7
0
PC
Opcode<9:0>
-
-
-
-
-
-
PCHBUF
Situation 2: CALL Instruction
PCH
PCL
STACK<9:0>
9 8 7
0
PC
Opcode<9:0>
-
-
-
-
-
-
PCHBUF
Situation 3: RETIA, RETFIE, or RETURN Instruction
PCH
PCL
STACK<9:0>
9 8 7
0
PC
-
-
-
-
-
-
PCHBUF
Situation 4: Instruction with PCL as destination
PCH
PCL
9 8 7
0
PC
-
-
-
-
-
-
ALU result<7:0>
or Opcode<7:0>
PCHBUF<1:0>
PCHBUF
Note: 1. Bits PC<9> and PCHBUF<1> are unimplemented for FM8P54/54E.
2. PCHBUF is used only for instruction with PCL as destination for FM8P54/54E/56/56E.