4. Program description

■Command list

command	function
@	Start of multiply-add description
*	multiplication
+	addition
−	subtraction
＞	Store (end of multiplication/addition description)
(	left parenthesis
)	right parenthesis
LDI	Memory access and loading into MEMS
L.D.Y.	Load from INPUTS to Y register
LDA	Load from INPUTS to A register

■Parameters

●Internal register

symbol	Explanation
REG	represents the previous multiplication/addition result
YREGH	Represents a part of YREG (see syntax explanation of multiplication and addition)
YREGL	Represents a part of YREG (see syntax explanation of multiplication and addition)
FREG	(See store grammar explanation)
ADREG	Address modulation (see store syntax explanation)

●Internal RAM

symbol	Explanation
MEMS00～1F	Place data read from external memory here
MIXS00～0F	Data from the sound source section appears here
TEMP00~7F	You can temporarily store the multiplication and addition results here.
EFREG00~0F	Put the processed data here
EXTS00～01	Data from external extension input appears here

●Memory access parameters

symbol	Explanation
MR［…］	Read from memory
MW［…］	Write to memory

※note

Describe the memory access description elements shown below in [...] according to the rules specified separately.

• User-defined address symbol
• DEC
• ADREG
• 1
• NF

■Program grammar

All mnemonics and parameters must be separated by one or more of the following defined delimiters: ``space'', ``comma (,)'', ``tab'', or ``newline''.

●Reading external memory and specifying the load destination MEMS (LDI)

LDI MEMSxx, MR[AddressElement(s)/NF]

• Do not include delimiters in the description of the external memory read parameter "MR[...]".

• "AddressElement(s)" represents a concatenation of separately indicated "address description elements" using the symbol "+".

• One address constant symbol (address symbol name defined by the user) must be included in the address description element of "AddressElement(s)".

●Load to YREG (LDY)

LDY INPUTS

●Load to ADREG (LDA)

LDA INPUTS

●Multiplication and addition

@ pM * pC ± ( pM * pC ± ( ... ( pM * pC ± ( pM * pC + pA ) ) ... ) )

pM: Multiplicand
pC: Multiplication coefficient
pA: aryl addition number

• The number of left parentheses "(" and ")" must match.

• The rightmost "(" must be to the left of the leftmost ")".

• There are restrictions on the combination of pM and pA as shown in the table below.

  pM	pA
  INPUTS	[PEG, TEMP00-TEMP7F]
  TEMP00-TEMP7F	[REG,T]※

  If you specify {TEMP00-TEMP7F} in pM and also specify TEMP in pA, only TEMP with the same subscript can be used. For this reason, pA is designated as “T”.

• When using a YREG value as an argument as a multiplication factor, use one of the notations {YREGH, YREGL}. Please refer to the table below for the differences between these two notations.

  Notation	Data passed to multiplier (13bits)
  YREGH	YREG bit23-bit11
  YREGL	0 YREG bit15-bit4

●Store

> optDestination(s)

opt	:Store option. One of {S1 / S2 / S3} or omitted.
Destination(s)	: Specify the storage destination. Select one or more items from "Groups A to D" shown below. Cannot be omitted.

group a	Any one of {TEMP00~7F}
group b	FREG
group c	ADREG
group d	Any one of {EFREG00~0F}

Note	When specifying ADREG for Destination(s), S3 must be specified for opt.

• With opt, specify the bit shift, overflow protection, and store mode of the data to be stored. The combinations are shown in the table below.

  First parameter setting	shift	overflow protection	Store mode
  omission	×1	With protection	A
  S1	×2	With protection	A
  S2	×2	No protection	A
  S3	×1	No protection	B

• Depending on the difference between store modes A and B, the data stored in ADREG and FREG differs as shown in the table below.

  Mode/register name	ADREG (12bits)	FREG (13bits)
  A	ssss INPUTS bit23-bit16	Shifter bit23-bit11
  B	Shifter bit23-bit12	0 Shifter bit11-bit0

  *Top 4 bits of ADREG/store mode A (in the table above)	ssss	) is equal to bit23 of INPUTS
  Filled (sign extended) with the value (sign bit).