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ST6369 Arkusz danych(PDF) 10 Page - STMicroelectronics

Numer części ST6369
Szczegółowy opis  8-BIT HCMOS MCU FOR DIGITAL CONTROLLED MULTI FREQUENCYMONITOR
Download  71 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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ST6369 CORE
The Core of the ST6369 is implemented inde-
pendently from the I/O or memory configuration.
Consequently, it can be treated as an independent
central processor communicating with I/O and mem-
ory via internal addresses, data, and control busses.
The in-core communication is arranged as shown
in the following block diagram figure; the controller
being externally linked to both the reset and the os-
cillator, while the core is linked to the dedicated on-
chip macrocells peripherals via the serial data bus
and indirectly for interrupt purposes through the
control registers.
Registers
The ST6369 Core has five registers and three
pairs of flags available to the programmer. They
are shown in Figure 4 and are explained in the fol-
lowing paragraphs together with the program and
data memory page registers.
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 is addressed in the data
space as RAM location at the FFH address.
Accordingly, the ST6369 instruction set can use
the accumulator as any other register of the data
space.
Figure 3. Core Block Diagram
SHORT
DIRECT
ADDRESSING
MODE
V REGISTER
W REGISTER
PROGRAM COUNTER
SIX LEVELS
STACK REGISTER
C
C
C
Z
Z
Z
NOR MAL FLAGS
INTERRUPT FLAGS
NMI FLAGS
INDEX
REGISTER
VA000423
b7
b7
b7
b7
b7
b0
b0
b0
b0
b0
b0
b11
ACCUMULATOR
Y REG. POINTER
X REG. POINTER
Figure 4. Core Programming Model
®
ST6369
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