ST52T430K3M6 STMicroelectronics, ST52T430K3M6 Datasheet - Page 11

• Manufacturer Part Number: ST52T430K3M6
• Manufacturer: STMicroelectronics

Specifications of ST52T430K3M6

• Cpu Family: ST52
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: SCI/UART
• Program Memory Type: EPROM
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 23
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5/5.8V
• Operating Supply Voltage (min): 2.7/3V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 34
• Package Type: SSO
• Lead Free Status / Rohs Status: Not Compliant

2 INTERNAL ARCHITECTURE
ST52x430 is made up of the following blocks and
peripherals:
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2.1 ST52x430 Operating Modes
ST52x430 works in two modes, Programming and
Working Modes, depending on the control signals
level RESET, TEST and V
The Operating modes are selected by setting the
control signal level as specified in the Control
Signals Setting table.
Table 2.1 Control Signals Setting
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-
Control Unit (CU) and Data Processing Unit
(DPU)
ALU / Fuzzy Core
EPROM
256 Byte RAM
Clock Oscillator
Analog Multiplexer and A/D Converter
3 PWM / Timers
SCI
Digital I/O port
Control
RESET
Signal
TEST
V
PP
gramming
Pro-
12 V
V
V
SS
SS
PP
Reset
V
V
V
SS
SS
SS
Working
V
V
V
DD
SS
SS
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
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.
2.2.1 Program Counter.
The Program Counter (PC) is a 13-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 13-bit length allows direct addressing of a
maximum of 8,192 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:
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2.2.2 Flags.
The ST52x430 core includes a different set of
flags that correspond to 2 different modes: normal
mode and interrupt mode. Each set of flags con-
sists 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.
JP (Jump)PC = Jump Address
InterruptPC = Interrupt Vector
RETIPC = Pop (stack)
RETPC = Pop (stack)
CALLPC = Subroutines address
ResetPC = Reset Vector
Normal InstructionPC = PC + 1
changing
the
structure
ST52T430/E430
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