CP3SP33SMSSLASHNOPB datasheet(18/407 Pages) TI1

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Dedicated Address Registers

Processor Status Register

PSR

General-Purpose Registers

R10

R11

R12

R13

Configuration Register

CFG

ISPL

USPL

INTBASEL

ISPH

USPH

INTBASEH

DS004

CP3SP33

SNOSCW5 – MAY 2013

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CPU Architecture

The CP3SP33 uses the CR16CPlus third-generation 16-bit CompactRISC processor core. The CPU

implements a Reduced Instruction Set Computer (RISC) architecture that allows an effective execution

rate of up to one instruction per clock cycle. For a detailed description of the CR16CPlus architecture, see

the CompactRISC CR16C Programmer’s Reference Manual which is available on the Texas Instruments

web site (http://www.ti.com).

The CR16CPlus CPU core includes these internal registers:

•

General-purpose registers (R0-R13, RA, and SP)

•

Dedicated address registers (PC, ISP, USP, and INTBASE)

•

Processor Status Register (PSR)

•

Configuration Register (CFG)

The R0-R11, PSR, and CFG registers are 16 bits wide. The R12, R13, RA, SP, ISP and USP registers are

32 bits wide. The PC register is 24 bits wide. Figure 5-1 shows the CPU registers.

Figure 5-1. CPU Registers

Some register bits are designated as “reserved.” Software must write a zero to these bit locations when it

writes to the register. Read operations from reserved bit locations return undefined values.

5.1

General-Purpose Registers

The CompactRISC CPU features 16 general-purpose registers. These registers are used individually as

16-bit operands or as register pairs for operations on addresses greater than 16 bits.

•

General-purpose registers are defined as R0 through R13, RA, and SP.

•

Registers are grouped into pairs based on the setting of the Short Register bit in the Configuration

with the architecture of the earlier CR16A/B CPU cores: (R1,R0), (R2,R1) ... (R11,R10), (R12_L, R11),

(R13_L, R12_L), (R14_L, R13_L) and SP. (R14_L, R13_L) is the same as (RA,ERA).

•

When the CFG.SR bit is clear, register pairs are grouped in the manner used by native CR16CPlus

software: (R1,R0), (R2,R1) ... (R11,R10), (R12_L, R11), R12, R13, RA, SP. R12, R13, RA, and SP are

32-bit registers for holding addresses greater than 16 bits.

CPU Architecture

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