w65c816s Microprocessor Data Sheet.pdf

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The Western Design Center, Inc.W65C816S Data Sheet2.11 Program Counter (PC)The 16-bit Program Counter (PC) Register provides the addresses which are used to step the microprocessorthrough sequential 8-bit program instruction fields. The PC is incremented for each 8-bit instruction field that isfetched from program memory.2.12 Stack Pointer (S)The Stack Pointer (S) is a 16-bit register which is used to indicate the next available location in the stack memoryarea. It serves as the effective address in stack addressing modes as well as subroutine and interrupt processing.The Stack Pointer provides simple implementation of nested subroutines and multiple-level interrupts. DuringEmulation mode, the S High-order byte (SH) is always equal to one. The bank address for all stack operations isBank zero.The Western Design Center W65C816S 10
The Western Design Center, Inc.W65C816S Data SheetVDDAO-A7A8-A15DO-D7 (816)ADDRESS BUFFER (LOW)ADDRESS BUFFER (HIGH)DATA BUS/BANK ADDRESS BUFFERINTERNAL ADDRESS BUS (16 BITS)INDEX X(16 BITS)INDEX Y(16 BITS)STACK POINTER(S) (16 BITS)ALU(16 BITS)TRANSFERSWITCHESACCUMULATOR(C) (16 BITS)(A) (8 BITS)(B) (8 BITS)PROG. COUNTER(PC) (16 BITS)DIRECT (D)(16 BITS)PROG. BANK (PBR)(8 BITS)DATA BANK (DBR)(8 BITS)DATALATCH/PREDECODEINTERNAL SPECIAL BUS (16 BITS)INTERNAL DATA BUS (16 BITS)PREDECODEREGISTER TRANSFERLOGICPROCESSORSTATUS (P)(8 BITS)INTERUPTLOGICINSTRUCTION DECODESUM OF MINTERMSINSTRUCTION REGISTER(8 BITS)TIMINGCONT.INSTRUCTION DECODEMINTERMSCLOCKGEN-ERATORSYSTEMCONT.VSSABORTBIRQBNMIBRESBRDYPHI2RWBVPAVDAMLBVPBEMXBEFigure 2-1W65C816S Internal Architecture Simplified Block DiagramThe Western Design Center W65C816S 11
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