Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 221)

MAXQ612/MAXQ622 User’s Guide

Maxim Integrated 16-11

Table 16-3. Destination Specifier Codes

dst

dst BIT

ENCODING

ddd dddd

WIDTH

16 OR 8

DESCRIPTION

NUL 111 0110 8/16

Null (Virtual) Destination; Intended As A Bit Bucket to Assist Software with

Pointer Increments/Decrements

MN[n] nnn 0NNN 8/16

nnnn Selects One of 1st Eight Registers in Module NNN, where NNN = 0

to 5; Access to Next 24 Using PFX[n]

AP 000 1000 8 Accumulator Pointer

APC 001 1000 8 Accumulator Pointer Control

PSF 100 1000 8 Processor Status Flag Register

IC 101 1000 8 Interrupt and Control Register

A[n] nnn 1001 8/16 nnn Selects One of 1st Eight Accumulators: A[0] to A[7]

Acc 000 1010 8/16 Active Accumulator = A[AP]

PFX[n] nnn 1011 8 nnn Selects One of Eight Prefix Registers

@++SP 000 1101 16 16-Bit Word @SP, Push (predecrement SP)

SP 001 1101 16 Stack Pointer

IV 010 1101 16 Interrupt Vector

LC[n] 11n 1101 16 n Selects One of Two Loop Counter Registers

@BP[OFFS] 000 1110 8/16 Data Memory @BP[OFFS]

@BP[++OFFS] 001 1110 8/16 Data Memory @BP[OFFS]; Preincrement OFFS

@BP[--OFFS] 010 1110 8/16 Data Memory @BP[OFFS]; Predecrement OFFS

OFFS 011 1110 8 Frame Pointer Offset from Base Pointer (BP)

DPC 100 1110 16 Data Pointer Control Register

GR 101 1110 16 General Register

GRL 110 1110 8 Low Byte of GR Register

BP 111 1110 16 Frame Pointer Base Pointer (BP)

@DP[n] n00 1111 8/16 Data Memory @DP[n]

@++DP[n] n01 1111 8/16 Data Memory @DP[n], Preincrement DP[n]

@--DP[n] n10 1111 8/16 Data Memory @DP[n], Predecrement DP[n]

DP[n] n11 1111 16 n Selects One of Two Data Pointers

2-CYCLE DESTINATION ACCESS USING PFX[n] Register (see Special Notes)

SC 000 1000 16 System Control Register

IPR0 001 1000 16 Interrupt Priority Register Zero

CKCN 110 1000 8 Clock Control Register

WDCN 111 1000 8 Watchdog Control Register

A[n] nnn 1001 16 nnn Selects One of 2nd Eight Accumulators A[8] to A[15]

GRH 001 1110 8 High Byte of GR Register

CP 011 1111 16 Code Pointer

1 2 ... 216 217 218 219 220 221 222 223 224 225 226 ... 254 255

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