EM78P458AP datasheet(51/76 Pages) EMC

51 / 76 page

EM78P458/459

OTP ROM

1: High frequency

• Bit 7 (RCT): Resistor Capacitor

0: Inter C, External R

1: External RC

• Bit 6 (HLP): Power consumption selection.

0: Low power.

1: High power.

• Bit 5 ~ Bit 0 (ID[5]~ID[0]): Customer’s ID.

2. Code Option Register (Word 1)

Bit12

Bit11

Bit10

Bit9

Bit8

Bit7

Bit6

Bit5

Bit4~Bit0

SIGN2

VOF2[2]

VOF2[1]

VOF2[0]

SIGN1

VOF1[2]

VOF1[1]

VOF1[0]

• Bit 12 (SIGN2): Polarity bit of offset voltage.

0: Negative voltage

1: Positive voltage

• Bit 11 ~ Bit 9 (VOF2[2]~VOF2[0]): Offset voltage bits

• Bit 8 (SIGN1): Polarity bit of offset voltage.

0: Negative voltage

1: Positive voltage

• Bit 7 ~ Bit 5 (VOF1[2]~VOF210)): Offset voltage bits

• Bit 4 ~ Bit 0 : Not used.

4.15 Instruction Set

Each instruction in the instruction set is a 13-bit word divided into an OP code and one or more

operands. Normally, all instructions are executed within one single instruction cycle (one instruction

consists of 2 oscillator periods), unless the program counter is changed by instruction "MOV R2,A",

"ADD R2,A", or by instructions of arithmetic or logic operation on R2 (e.g. "SUB R2,A", "BS(C) R2,6",

"CLR R2",

⋅⋅⋅⋅). In this case, the execution takes two instruction cycles.

In addition, the instruction set has the following features:

(1) Every bit of any register can be set, cleared, or tested directly.

(2) The I/O registers can be regarded as general registers. That is, the same instruction can operate

on I/O registers.

The symbol "R" represents a register designator that specifies which one of the registers (including

operational registers and general-purpose registers) is to be utilized by the instruction. The symbol

"b" represents a bit field designator that selects the value for the bit located in the register "R" that is

This specification is subject to change without prior notice.

06.25.2004 (V1.4)

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