user manual

NOTATION

A - 6 INSTRUCTION SET DETAILS

MOTOROLA

ea Effective Address

eax Effective Address for X Bus

eay Effective Address for Y Bus

xxxx Absolute Address (16 Bits)

xxx Short Jump Address (12 Bits)

aa Absolute Short Address (6 Bits, Zero Extended)

pp I/O Short Address (6 Bits, Ones Extended)

<. . .> Speciﬁes the Contents of the Speciﬁed Address

X: X Memory Reference

Y: Y Memory Reference

L: Long Memory Reference = X:Y

P: Program Memory Reference

Address Operands

PC Program Counter Register (16 Bits)

MR Mode Register (8 Bits)

CCR Condition Code Register (8 Bits)

SR Status Register = MR:CCR (16 Bits)

OMR Operating Mode Register (8 Bits)

LA Hardware Loop Address Register (16 Bits)

LC Hardware Loop Counter Register (16 Bits)

SP System Stack Pointer Register (6 Bits)

SSH Upper Portion of the Current Top of the Stack (16 Bits)

SSL Lower Portion of the Current Top of the Stack (16 Bits)

SS System Stack RAM = SSH: SSL (15 Locations by 32 Bits)

Program Control Unit Registers Operands

Table A-1 Instruction Description Notation (Continued)