16C84 datasheet(8/110 Pages) MICROCHIP

8 / 110 page

PIC16C84

DS30445D-page 8

 1996-2013 Microchip Technology Inc.

PIC16CXX devices contain an 8-bit ALU and working

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,

subtraction, shift and logical operations. Unless

otherwise mentioned, arithmetic operations are two's

complement in nature. In two-operand instructions,

typically

one

operand

the

working

(W register), and 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.

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,

respectively, in subtraction. See the SUBLW and SUBWF

instructions for examples.

A simplified block diagram for the PIC16C84 is shown

in Figure 3-1, its corresponding pin description is

shown in Table 3-1.

FIGURE 3-1:

PIC16C84 BLOCK DIAGRAM

EEPROM

Program

Memory

Program Counter

Program

Bus 14

Instruction reg

8 Level Stack

(13-bit)

Direct Addr

Instruction

Decode &

Control

Timing

Generation

OSC2/CLKOUT

OSC1/CLKIN

Power-up

Timer

Oscillator

Start-up Timer

Power-on

Reset

Watchdog

Timer

MCLR

VDD, VSS

W reg

ALU

MUX

I/O Ports

TMR0

STATUS reg

FSR reg

Indirect

Addr

RA3:RA0

RB7:RB1

RA4/T0CKI

EEADR

EEPROM

Data Memory

64 x 8

EEDATA

Addr Mux

RAM Addr

RAM

File Registers

EEPROM Data Memory

Data Bus 8

1K x 14

36 x 8

RB0/INT

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