ST72E331 datasheet(91/107 Pages) STMICROELECTRONICS

Part #	ST72E331

Description	8-BIT MCU WITH 8 TO 16K OTP/EPROM, 256 EEPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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ST72E331 ST72T331

INSTRUCTION GROUPS (Cont’d)

Mnemo

Description

Function/Example

Dst

Src

H

I

N

Z

C

JRULE

Jump if (C + Z = 1)

Unsigned <=

LD

Load

dst <= src

reg, M

M, reg

N

Z

MUL

Multiply

X,A = X * A

A, X, Y

X, Y, A

0

NEG

Negate (2’s compl)

neg $10

reg, M

N

Z

C

NOP

No Operation

OR

OR operation

A = A + M

A

M

N

Z

POP

Pop from the Stack

pop reg

reg

M

pop CC

CC

M

H

I

N

Z

C

PUSH

Push onto the Stack

push Y

M

reg, CC

RCF

Reset carry flag

C = 0

0

RET

Subroutine Return

RIM

Enable Interrupts

I = 0

0

RLC

Rotate left true C

C <= Dst <= C

reg, M

N

Z

C

RRC

Rotate right true C

C => Dst => C

reg, M

N

Z

C

RSP

Reset Stack Pointer

S = Max allowed

SBC

Subtract with Carry

A = A - M - C

A

M

N

Z

C

SCF

Set carry flag

C = 1

1

SIM

Disable Interrupts

I = 1

1

SLA

Shift left Arithmetic

C <= Dst <= 0

reg, M

N

Z

C

SLL

Shift left Logic

C <= Dst <= 0

reg, M

N

Z

C

SRL

Shift right Logic

0 => Dst => C

reg, M

0

Z

C

SRA

Shift right Arithmetic

Dst7 => Dst => C

reg, M

N

Z

C

SUB

Subtraction

A = A - M

A

M

N

Z

C

SWAP

SWAP nibbles

Dst[7..4] <=> Dst[3..0] reg, M

N

Z

TNZ

Test for Neg & Zero

tnz lbl1

N

Z

TRAP

S/W trap

S/W interrupt

1

WFI

Wait for Interrupt

0

XOR

Exclusive OR

A = A XOR M

A

M

N

Z

91

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