S3C4530A datasheet(68/432 Pages) SAMSUNG

No de pièce	S3C4530A

Description	16/32-bit RISC microcontroller is a cost-effective, high-performance microcontroller

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Fabricant	SAMSUNG [Samsung semiconductor]

Site Internet	http://www.samsung.com/Products/Semiconductor

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68 / 432 page

INSTRUCTION SET

S3C4530A

3-26

CPSR FLAGS

Setting the CPSR flags is optional, and is controlled by the S bit in the instruction. The N and Z flags are set

correctly on the result (N is equal to bit 63 of the result, Z is set if and only if all 64 bits of the result are zero).

Both the C and V flags are set to meaningless values.

INSTRUCTION CYCLE TIMES

MULL takes 1S + (m+1)I and MLAL 1S + (m+2)I cycles to execute, where m is the number of 8 bit multiplier

array cycles required to complete the multiply, which is controlled by the value of the multiplier operand specified

by Rs.

Its possible values are as follows:

For Signed Instructions SMULL, SMLAL:

— If bits [31:8] of the multiplier operand are all zero or all one.

— If bits [31:16] of the multiplier operand are all zero or all one.

— If bits [31:24] of the multiplier operand are all zero or all one.

— In all other cases.

For Unsigned Instructions UMULL, UMLAL:

— If bits [31:8] of the multiplier operand are all zero.

— If bits [31:16] of the multiplier operand are all zero.

— If bits [31:24] of the multiplier operand are all zero.

— In all other cases.

S and I are defined as sequential (S-cycle) and internal (I-cycle), respectively.

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