Motorola M6800 manual MPU-2

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MPU-2

Microprocessing Unit (MC6800)

The nucleus of the M6800 Microcomputer Family is the microprocessing unit (MPU). The MPU is enclosed in a 40 pin package as shown below:

Features included in the MPU are:

1.Two accumulators (ACCA and ACCB)

2.One index register (X)

3.One program counter register (PC)

4.One stack pointer register (SP)

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Contents MPU-1 Introduction MPU-2 MPU-3 MPU-4 MPU-5 BIT N0 Function MPU-7 READ/WRITE R/W Data BUS EnabledbeMPU-8 Valid Memory AddressvmaMPU-9 NON-MASKABLE InterruptnmiBUS Available BA THREE-STATE Control TSC Address BUS AO/A15ADC ABAINS INXPage MPU-14 Summary of MPU Operation Reset Sequence IRQ Sequence NMI Sequence RTI ExecutionSWI Instruction Page Page Page Page Page Page Page Page