PIC16C55AT-40/SS【PDF 13/194 页】IC MCU OTP 512X12 28SSOP

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2002 Microchip Technology Inc.

Preliminary

DS30453D-page 9

PIC16C5X

3.0

ARCHITECTURAL OVERVIEW

The high performance of the PIC16C5X family can be

attributed to a number of architectural features com-

monly found in RISC microprocessors. To begin with,

the PIC16C5X uses a Harvard architecture in which

program and data are accessed on separate buses.

This improves bandwidth over traditional von Neumann

architecture where program and data are fetched on

the same bus. Separating program and data memory

further allows instructions to be sized differently than

the 8-bit wide data word. Instruction opcodes are 12

bits wide making it possible to have all single word

instructions. A 12-bit wide program memory access

bus fetches a 12-bit instruction in a single cycle. A two-

stage pipeline overlaps fetch and execution of instruc-

tions. Consequently, all instructions (33) execute in a

single cycle except for program branches.

The PIC16C54/CR54 and PIC16C55 address 512 x 12

of program memory, the PIC16C56/CR56 address

1K x 12 of program memory, and the PIC16C57/CR57

and PIC16C58/CR58 address 2K x 12 of program

memory. All program memory is internal.

The PIC16C5X can directly or indirectly address its

isters including the program counter are mapped in the

data memory. The PIC16C5X has a highly orthogonal

(symmetrical) 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

PIC16C5X simple yet efficient. In addition, the learning

curve is reduced significantly.

The PIC16C5X device contains an 8-bit ALU and work-

ing register. The ALU is a general purpose arithmetic

unit. It performs arithmetic and Boolean functions

between data in the working register and any register

file.

The ALU is 8 bits wide and capable of addition, subtrac-

tion, shift and logical operations. Unless otherwise

mentioned, arithmetic operations are two's comple-

ment in nature. In two-operand instructions, typically

one operand is the W (working) register. The other

operand is either a file register or an immediate con-

stant. In single operand instructions, the operand is

either the W register or a file register.

The W register is an 8-bit working register used for ALU

operations. It is not an addressable 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 and digit borrow out bit, respec-

tively, in subtraction. See the SUBWF and ADDWF

instructions for examples.

A simplified block diagram is shown in Figure 3-1, with

the corresponding device pins described in Table 3-1

(for PIC16C54/56/58) and Table 3-2 (for PIC16C55/

57).

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