ST72C334J2B6 STMicroelectronics, ST72C334J2B6 Datasheet - Page 23
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ST72C334J2B6
Manufacturer Part Number
ST72C334J2B6
Description
8-bit Microcontrollers - MCU Flash 8K SPI/SCI
Manufacturer
STMicroelectronics
Datasheet
1.ST72C334J2B6.pdf
(153 pages)
Specifications of ST72C334J2B6
Product Category
8-bit Microcontrollers - MCU
Core
ST7
Data Bus Width
8 bit
Maximum Clock Frequency
8 MHz
Program Memory Size
8 KB
Data Ram Size
384 B
On-chip Adc
Yes
Operating Supply Voltage
3.2 V to 5.5 V
Package / Case
SDIP-42
Mounting Style
Through Hole
A/d Bit Size
8 bit
A/d Channels Available
8
Data Rom Size
256 B
Interface Type
SCI, SPI
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
32
Number Of Timers
4 bit
Program Memory Type
Flash
Factory Pack Quantity
13
Supply Voltage - Max
5 V
Supply Voltage - Min
3.2 V
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ST72C334J2B6
Manufacturer:
ST
Quantity:
507
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8 CENTRAL PROCESSING UNIT
8.1 INTRODUCTION
This CPU has a full 8-bit architecture and contains
six internal registers allowing efficient 8-bit data
manipulation.
8.2 MAIN FEATURES
8.3 CPU REGISTERS
The 6 CPU registers shown in
present in the memory mapping and are accessed
by specific instructions.
Figure 10. CPU Registers
63 basic instructions
Fast 8-bit by 8-bit multiply
17 main addressing modes
Two 8-bit index registers
16-bit stack pointer
Low power modes
Maskable hardware interrupts
Non-maskable software interrupt
RESET VALUE = STACK HIGHER ADDRESS
RESET VALUE = RESET VECTOR @ FFFEh-FFFFh
15
15
RESET VALUE = 1
PCH
8
8 7
RESET VALUE = XXh
RESET VALUE = XXh
RESET VALUE = XXh
7
7
7
7
1
7
1 1 X 1 X X
1 1 H I
Figure 10
PCL
N Z
are not
0
0
0
0
X
0
C
0
Accumulator (A)
The Accumulator is an 8-bit general purpose reg-
ister used to hold operands and the results of the
arithmetic and logic calculations and to manipulate
data.
Index Registers (X and Y)
In indexed addressing modes, these 8-bit registers
are used to create either effective addresses or
temporary storage areas for data manipulation.
(The Cross-Assembler generates a precede in-
struction (PRE) to indicate that the following in-
struction refers to the Y register.)
The Y register is not affected by the interrupt auto-
matic procedures (not pushed to and popped from
the stack).
Program Counter (PC)
The program counter is a 16-bit register containing
the address of the next instruction to be executed
by the CPU. It is made of two 8-bit registers PCL
(Program Counter Low which is the LSB) and PCH
(Program Counter High which is the MSB).
X INDEX REGISTER
Y INDEX REGISTER
ACCUMULATOR
PROGRAM COUNTER
CONDITION CODE REGISTER
STACK POINTER
ST72334J/N, ST72314J/N, ST72124J
X = Undefined Value
23/153
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