CP80S54 Datasheet, PDF (8/47 Pages) List of Unclassifed Manufacturers – EPROM/ROM-Based 8-Bit Microcontroller Series

CP80S54/56
FIGURE 2.2: Loading of PC in Different Situations
Situation 1: GOTO Instruction
PCH
PCL
987
0
PC
------
PCHBUF
Situation 2: CALL Instruction
PCH
PCL
987
0
PC
------
PCHBUF
Situation 3: RETIA, RETFIE, or RETURN Instruction
PCH
PCL
987
0
PC
Opcode<9:0>
STACK<9:0>
Opcode<9:0>
STACK<9:0>
------
PCHBUF
Situation 4: Instruction with PCL as destination
PCH
PCL
987
0
PC
PCHBUF<1:0>
------
PCHBUF
ALU result<7:0>
or Opcode<7:0>
Note: 1. Bits PC<9> and PCHBUF<1> are unimplemented for CP80S54/S54E.
2. PCHBUF is used only for instruction with PCL as destination for CP80S54/S54E/56/S56E.
Rev0.1 Nov 30, 2005
P.8/CP80S54/S56