Microchip PIC24F32KA304 Handleiding

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© 2006 Microchip Technology Inc. Advance Information DS39703A-page 2-1
CPU
2
Section 2. CPU
HIGHLIGHTS
This section of the manual contains the following topics:
2.1 Introduction .................................................................................................................... 2-2
2.2 Programmer’s Model...................................................................................................... 2-4
2.3 Software Stack Pointer................................................................................................... 2-7
2.4 CPU Register Descriptions .......................................................................................... 2-10
2.5 Arithmetic Logic Unit (ALU).......................................................................................... 2-13
2.6 Multiplication and Divide Support................................................................................. 2-14
2.7 Compiler Friendly Architecture..................................................................................... 2-17
2.8 Multi-Bit Shift Support .................................................................................................. 2-17
2.9 Instruction Flow Types ................................................................................................. 2-18
2.10 Program Flow Loop Control ......................................................................................... 2-20
2.11 Address Register Dependencies ................................................................................. 2-22
2.12 Register Maps.............................................................................................................. 2-25
2.13 Related Application Notes............................................................................................ 2-26
2.14 Revision History........................................................................................................... 2-27
PIC24F Family Reference Manual
DS39703A-page 2-2 Advance Information © 2006 Microchip Technology Inc.
2.1 INTRODUCTION
The PIC24F CPU module has a 16-bit (data) modified Harvard architecture with an enhanced
instruction set. The CPU has a 24-bit instruction word with a variable length opcode field. The
Program Counter (PC) is 24 bits wide and addresses up to 4M x 24 bits of user program memory
space. A single-cycle instruction prefetch mechanism is used to help maintain throughput and
provides predictable execution. All instructions execute in a single cycle, with the exception of
instructions that change the program flow, the double-word move (MOV.D) instruction and the
table instructions. Overhead-free program loop constructs are supported using the REPEAT
instructions, which are interruptible at any point.
The PIC24F devices have sixteen, 16-bit working registers in the programmer’s model. Each of
the working registers can act as a data, address or address offset register. The 16th working
register (W15) operates as a Software Stack Pointer for interrupts and calls. The 15th working
register (W14) can be used as a Stack Frame Pointer when used with instructions.LNK and UNLK
The upper 32 Kbytes of the data space memory map can optionally be mapped into program
space at any 16K word program boundary defined by the 8-bit Program Space Visibility Page
(PSVPAG) register. The data to program space mapping feature lets any instruction access pro-
gram space as if it were data space. Refer to Section 4.4 “Program Space Visibility from Data
Space” for more information on Program Space Visibility.
The Instruction Set Architecture (ISA) is significantly enhanced beyond that of the PIC18F but
maintains an acceptable level of backward compatibility. All PIC18F instructions and addressing
modes are supported either directly or through simple macros. Many of the ISA enhancements
are driven by compiler efficiency needs.
The core supports Inherent (no operand), Relative, Literal and Memory Direct Addressing
modes, and 3 groups of addressing modes (MODE1, MODE2 and MODE3). All modes support
Register Direct and various Register Indirect Addressing modes. Each group offers up to seven
addressing modes. Instructions are associated with predefined addressing modes depending
upon their functional requirements.
There is also a ‘Register Indirect with Signed 10-Bit Offset’ Addressing mode dedicated to two
special move instructions, LDWLO and STWLO. Refer to Section 32. “Instruction Set” for more
details.
For most instructions, the core is capable of executing a data (or program data) memory read, a
working register (data) read, a data memory write and a program (instruction) memory read per
instruction cycle. As a result, three parameter instructions can be supported, allowing A + B = C
operations to be executed in a single cycle.
A high-speed, 17-bit by 17-bit multiplier is included to significantly enhance the core arithmetic
capability and throughput. The multiplier supports Signed, Unsigned and Mixed mode, 16-bit by
16-bit or 8-bit by 8-bit integer multiplication. All multiply instructions execute in a single cycle.
The 16-bit ALU is enhanced with integer divide assist hardware that supports an iterative
non-restoring divide algorithm. It operates in conjunction with the REPEAT instruction looping
mechanism, and a selection of iterative divide instructions, to support 32-bit (or 16-bit) divided by
16-bit integer signed and unsigned division. All divide operations require 19 cycles to complete,
but are interruptible at any cycle boundary.
The PIC24F has a vectored exception scheme with up to 8 sources of non-maskable traps and
interrupt sources. Each interrupt source can be assigned to one of seven priority levels.
A block diagram of the CPU is shown in Figure 2-1.
© 2006 Microchip Technology Inc. Advance Information DS39703A-page 2-3
Section 2. CPU
CPU
2
Figure 2-1: PIC24F CPU Core Block Diagram
Power-up
Timer
Oscillator
Start-up Timer
POR/BOR
Reset
Watchdog
Timer
Instruction
Decode &
Control
OSC1/CLKI
MCLR
Timing
Generation
16
PCH PCL
16
Program Counter
16-Bit ALU
23
23
24
23
Data Bus
IR
PCU
16
16 x 16
W Reg Array
ROM Latch
16
EA MUX
RAGU
WAGU
16
16
16
16
8
Interrupt
Controller PSV & Table
Data Access
Control Block
Stack
Control
Logic
Loop
Control
Logic
Data Latch
Data
RAM
Address
Latch
Control Signals
to Various Blocks
Address Latch
Program Memory
Data Latch
I/O Ports
16
16
Address Bus
16
Literal Data
Peripherals
Multiplier
and Divide
Support

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: PIC24F32KA304

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