EM78P451WM datasheet(46/54 Pages) EMC

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EM78P451

8-Bit Microcontroller with OTP ROM

•

Product Specification (V1.1) 06.30.2003

(This specification is subject to change without further notice)

Bit 7 (RCT):

Resistor Capacitor.

0: internal RC

1: external RC

Bit 6 (HLP):

Power consumption selection.

0: Low power

1: High power

Bit 5 ~ Bit 4:

DEL1 and DEL0 (SDI) input delay time options.

DEL 1

DEL 0

Delay time

0 ns

50 ns

100 ns

Bit3~0 (ID):

User’s ID code.

4.11 Instruction Set

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

or more operands. All instructions are executed within one single instruction cycle

(consisting of 2 oscillator periods), unless the program counter is changed by-

(a) Executing the instruction "MOV R2,A", "ADD R2,A", "TBL", or any other instructions

that write to R2 (e.g. "SUB R2,A", "BS R2,6", "CLR R2",

⋅⋅⋅⋅).

(b) execute CALL, RET, RETI, RETL, JMP, Conditional skip (JBS, JBC, JZ, JZA, DJZ,

DJZA) which were tested to be true.

Under these cases, 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 register can be regarded as general register. That is, the same instruction

can operate on I/O register.

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. Bits 6 and 7 in R4 determine the selected register bank. "b"

represents a bit field designator that selects the value for the bit located in the register

"R" and affects operation. "k" represents an 8 or 10-bit constant or literal value.

EM78P451WM Datasheet(PDF) 46 Page - ELAN Microelectronics Corp

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