ST52F510 datasheet(18/106 Pages) STMICROELECTRONICS

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ST52F510/F513/F514

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Figure 2.2 Data Processing Unit (DPU)

The

DPU

receives,

stores

and

sends

the

instructions

deriving

from

the

Program/Data

Memory, Register File or from the peripherals. It is

controlled by the CU on the basis of the decoded

instruction. The Fuzzy registers store the partial

results of the fuzzy computation. The accumulator

directly: the instructions used by the ALU can

address

all

the

File

locations

operands, allowing a more compact code and a

faster execution.

The following addressing modes are available:

inherent, immediate, direct, indirect, bit direct.

2.1.1 Program Counter.

The Program Counter (PC) is a 16-bit register that

contains the address of the next memory location

to be processed by the core. This memory location

may be both an instruction or data address.

The Program Counter’s 16-bit length allows the

direct addressing of a maximum of 64 Kbytes in the

Program/Data Memory space.

The PC can be changed in the following ways:

JP (Jump)

PC = Jump Address

Interrupt

PC = Interrupt Vector

RETI

PC = Pop (stack)

RET

PC = Pop (stack)

CALL

PC = Subroutines address

Reset

PC = Reset Vector

Normal Instruction

PC = PC + 1

2.1.2 Flags.

The ST FIVE core includes different sets of flags

that correspond to 2 different modes: normal mode

and interrupt mode. Each set of flags consist of a

CARRY flag (C), ZERO flag (Z) and SIGN flag (S).

Each set is stacked: one set of flags is used during

normal operation and other sets are used during

each level of interrupt. Formally, the user has to

manage only one set of flags: C, Z and S since the

flag stack operation is performed automatically.

PROGRAM COUNTER

FILE

256 Bytes

ADDRESS

ACCUMULATOR

DECISION

REGISTERS

ALU

FLAGS REG.

Memory Address

Peripherals

Control Unit

Program Memory

Input Registers

Peripherals

Interrupts Unit

PROCESSOR

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