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參數(shù)資料
| 型號： | ST52X420 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | ADC |
| 英文描述： | 8-BIT INTELLIGENT CONTROLLER UNIT (ICU) Three Timer/PWMs, ADC, WDG |
| 中文描述： | 8位智能控制器病房（ICU）3個定時器/的PWM，ADC的，水分散粒劑 |
| 文件頁數(shù)： | 15/84頁 |
| 文件大?。?/td> | 1274K |
| 代理商： | ST52X420 |
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ST52T410/ST52T420/E420
15/84
2 INTERNAL ARCHITECTURE
ST52T410/ST52x420 are made up of the following
blocks and peripherals:
I
Control Unit (CU) and Data Processing Unit
(DPU)
I
ALU / Fuzzy Core
I
EPROM
I
128 Byte RAM
I
Clock Oscillator
I
Analog Multiplexer and A/D Converter
(ST52x420 only)
I
3 PWM / Timers
I
Digital I/O port
2.1 ST52T410/ST52x420 Operating Modes
ST52T410/ST52x420 works in two modes,
Programming and Working Modes, depending on
the control signals level RESET, TEST and V
PP
The Operating modes are selected by setting the
control signal level as specified in the Control
Signals Setting table.
2.2 Control Unit and Data Processing Unit
The Control Unit (CU) formally includes five main
blocks. Each block decodes a set of instructions,
generating the appropriate control signals. The
main parts of the CU are illustrated in Figure 2.1.
The five different parts of the CU manage Loading,
Logic/Arithmetic, Jump, Control and the Fuzzy
instruction set.
The block called
“
Collector
”
manages the signals
deriving from the different parts of the CU, defining
the signals for the Data Processing Unit (DPU) and
the different peripherals of the microcontroller.
The block called
“
Arbiter
”
manages the different-
parts of the CU so that only one part of the system
is activated during working mode.
The CU structure is very flexible. It was designed
with the purpose of easily adapting the core of the
microcontroller to market needs. New instruction
sets or new peripherals can be easily included
without
changing
the
microcontroller, maintaining code compatibility.
The CU reads the instructions stored on EPROM
(Fetch) and decodes them. According to the
instruction types, the arbiter activates one of the
main blocks of the CU. Afterwards, all the control
signals for the DPU are generated.
A set of 46 different arithmetic, fuzzy and logic
instructions is available. Each instruction requires
6 (fuzzy instructions) to 26 (DIVISION) clock
pulses to be performed.
The DPU receives, stores and sends instructions
deriving from EPROM, RAM or peripherals in order
to execute them.
structure
of
the
2.2.1 Program Counter.
The Program Counter (PC) is a 12-bit register that
contains the address of the next memory location
to be processed by the core. This memory location
may be an opcode, operand, or an address of an
operand.
The 12-bit length allows direct addressing of a
maximum of 4,096 bytes in the program space.
After having read the current instruction address,
the PC value is incremented. The result of this
operation is shifted back into the PC.
The PC can be changed in the following ways:
I
JP (Jump)PC = Jump Address
I
InterruptPC = Interrupt Vector
I
RETIPC = Pop (stack)
I
RETPC = Pop (stack)
I
CALLPC = Subroutines address
I
ResetPC = Reset Vector
I
Normal InstructionPC = PC + 1
2.2.2 Flags.
The ST52T410/ST52x420 core includes a differ-
ent set of flags that correspond to 2 different
modes: normal mode and interrupt mode. Each
set of flags consists of a CARRY flag (C), ZERO
flag (Z) and SIGN flag (S).
One set (CN, ZN, SN) is used during normal
operation and one is used during interrupt mode
(CI, ZI, SI).
Formally, the user has to manage
only one set of flags: C, Z and S
.
Table 2.1 Control Signals Setting
Control
Signal
Pro-
gramming
Reset
Working
RESET
V
SS
V
SS
V
DD
TEST
V
SS
V
SS
V
SS
V
PP
12 V
V
SS
V
SS
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| ST52X430 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT INTELLIGENT CONTROLLER UNIT ICU Three Timer/PWMs, ADC, SCI |
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