datasheetbank_Logo   Integrated circuits, Transistor, Semiconductors Search and Datasheet PDF Download Site
Part Name :   

ST6201CT1 View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
ST6201CT1 8-bit MCUs with A/D converter,two timers, oscillator safeguard & safe reset ST-Microelectronics
STMicroelectronics ST-Microelectronics
ST6201CT1 Datasheet PDF : 100 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
ST6200C ST6201C ST6203C
4 CENTRAL PROCESSING UNIT
4.1 INTRODUCTION
The CPU Core of ST6 devices is independent of the
I/O or Memory configuration. As such, it may be
thought of as an independent central processor
communicating with on-chip I/O, Memory and Pe-
ripherals via internal address, data, and control
buses.
4.2 MAIN FEATURES
40 basic instructions
9 main addressing modes
Two 8-bit index registers
Two 8-bit short direct registers
Low power modes
Maskable hardware interrupts
6-level hardware stack
4.3 CPU REGISTERS
The ST6 Family CPU core features six registers and
three pairs of flags available to the programmer.
These are described in the following paragraphs.
Accumulator (A). The accumulator is an 8-bit
general purpose register used in all arithmetic cal-
culations, logical operations, and data manipula-
tions. The accumulator can be addressed in Data
Space as a RAM location at address FFh. Thus
the ST6 can manipulate the accumulator just like
any other register in Data Space.
Index Registers (X, Y). These two registers are
used in Indirect addressing mode as pointers to
memory locations in Data Space. They can also
be accessed in Direct, Short Direct, or Bit Direct
addressing modes. They are mapped in Data
Space at addresses 80h (X) and 81h (Y) and can
be accessed like any other memory location.
Short Direct Registers (V, W). These two regis-
ters are used in Short Direct addressing mode.
This means that the data stored in V or W can be
accessed with a one-byte instruction (four CPU cy-
cles). V and W can also be accessed using Direct
and Bit Direct addressing modes. They are
mapped in Data Space at addresses 82h (V) and
83h (W) and can be accessed like any other mem-
ory location.
Note: The X and Y registers can also be used as
Short Direct registers in the same way as V and W.
Program Counter (PC). The program counter is a
12-bit register which contains the address of the
next instruction to be executed by the core. This
ROM location may be an opcode, an operand, or
the address of an operand.
Figure 7. CPU Registers
7
0
RESET VALUE = xxh
7
0
RESET VALUE = xxh
7
0
RESET VALUE = xxh
7
0
RESET VALUE = xxh
7
0
RESET VALUE = xxh
ACCUMULATOR
X INDEX REGISTER
Y INDEX REGISTER
V SHORT INDIRECT
REGISTER
W SHORT INDIRECT
REGISTER
SIX LEVEL
STACK
NORMAL FLAGS
INTERRUPT FLAGS
NMI FLAGS
CN ZN
CI ZI
CNMI ZNMI
11
0
PROGRAM COUNTER
RESET VALUE = RESET VECTOR @ 0FFEh-0FFFh
x = Undefined value
16/100
1
Doc ID 4563 Rev 5
Direct download click here
 

Share Link : ST-Microelectronics
All Rights Reserved © datasheetbank.com 2014 - 2019 [ Privacy Policy ] [ Request Datasheet ] [ Contact Us ]