4. Program description

■ Command list

Command	function
@	Start of multiplication / addition description
*	Multiply
＋	Addition
−	Subtraction
＞	Store (end of multiplication / addition description)
(	Left parenthesis
)	Right parenthesis
LDI	Memory access and loading into MEMS
LDY	Loading from INPUTS to Y register
LDA	Loading from INPUTS to A register

■ Parameters

● Internal register

Symbol	Explanation
REG	Represents the last multiplication / addition result
YREGH	Represents a part of YREG (see Multiply-accumulation grammar explanation)
YREGL	Represents a part of YREG (see Multiply-accumulation grammar explanation)
FREG	(Refer to the grammar explanation of the store)
ADREG	Address modulation (see store grammar explanation)

● Internal RAM

Symbol	Explanation
MEMS00 ~ 1F	Put the data read from the external memory here
MIXS00 ~ 0F	Data from the sound source section appears here
TEMP00-7F	Multiply-accumulation results can be temporarily placed here
EFREG00 ~ 0F	Put the processed data here
EXTS00-01	Data from external extended inputs appear here

● Parameters for memory access

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

※note

In [...], describe the following memory access description elements 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 defined delimiters: "whitespace", "comma (,)", "tab", or "newline".

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

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

• Delimiters must not be included in the description of the external memory read parameter "MR [...]".

• "AddressElement (s)" represents the "address description element" shown separately, which is concatenated with the symbol "+".

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

● Load to YREG (LDY)

LDY INPUTS

● Load to ADREG (LDA)

LDA INPUTS

● Multiply-accumulation

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

pM: Multiplied number
pC: Multiplication coefficient
pA: Number of additions

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

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

• The combination of pM and pA has the following restrictions.

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

  If you specify {TEMP00-TEMP7F} in pM and also specify TEMP in pA, you can only use TEMPs with the same subscript. Therefore, specify "T" for pA.

• When using the value of YREG as the multiplication coefficient as an argument, use either {YREGH, YREGL} notation. Please refer to the following table for the difference between these two notations.

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

● Store

> opt Destination (s)

opt	: Store options. Any one of {S1 / S2 / S3}, or omitted.
Destination (s)	: Specify the store destination. Select one or more in total from "Group a to Group d" shown below. Cannot be omitted.

Group a	One of {TEMP00-7F}
Group b	FREG
Group c	ADREG
Group d	One of {EFREG00 ~ 0F}

caution	When specifying ADREG for Destination (s), You must specify S3 for opt.

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

  1st parameter setting	shift	Overflow protection	Store mode
  omit	× 1	With protection	A
  S1	× 2	With protection	A
  S2	× 2	No protection	A
  S3	× 1	No protection	B

• The data stored in ADREG and FREG differs as shown in the table below due to the difference in store mode A / B.

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

  * Upper 4 bits of ADREG / store mode A (in the table above)	ssss	) Is equal to bit23 of INPUTS
  It is filled (sign-extended) with a value (sign bit).