PIC14000T-20I/JW 查看數據表（PDF） - Microchip Technology

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PIC14000T-20I/JW

28-Pin Programmable Mixed Signal Controller

Microchip Technology 

3.0 ARCHITECTURAL OVERVIEW

The PIC14000 addresses 4K x 14 program memory. All

program memory is internal. The PIC14000 can directly

or indirectly address its register files or data memory. All

special function registers including the program counter

are mapped in the data memory. The PIC14000 has an

orthogonal instruction set that makes it possible to

carry out any operation on any register using any

addressing mode. This symmetrical nature and lack of

‘special optimal situations’ make programming with the

PIC14000 simple yet efficient. In addition, the learning

curve is reduced significantly.

The PIC14000 contains an 8-bit ALU and working

register. The ALU performs arithmetic and Boolean

functions between data in the working register and any

register file.

PIC14000

The ALU is capable of addition, subtraction, shift, and

logical operations. Unless otherwise mentioned,

arithmetic operations are two's complement. In

two-operand instructions, typically one operand is the

working register (W register). The other operand is a

file register or an immediate constant. In single

operand instructions, the operand is either the

W register or a file register.

Depending on the instruction executed, the ALU may

affect the values of the Carry (C), Digit Carry (DC), and

Zero (Z) bits in the STATUS register. The C and DC bits

operate as a borrow bit and a digit borrow out bit,

respectively, in subtraction. See the SUBLW and SUBWF

instructions for examples.

A simplified block diagram for the PIC14000 is shown

in Figure 3-1, its corresponding pin description is

shown in Table 3-1.

© 1996 Microchip Technology Inc.

Preliminary

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