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16C84 Datasheet(PDF) 8 Page - Microchip Technology |
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16C84 Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 110 page  PIC16C84 DS30445D-page 8 1996-2013 Microchip Technology Inc. PIC16CXX devices contain an 8-bit ALU and working 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, subtraction, shift and logical operations. Unless otherwise mentioned, arithmetic operations are two's complement in nature. In two-operand instructions, typically one operand is the working register (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 13 Program Bus 14 Instruction reg 8 Level Stack (13-bit) Direct Addr 8 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 5 7 7 1K x 14 36 x 8 RB0/INT |
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