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ST92195C6 Folha de dados(PDF) 8 Page - STMicroelectronics

Nome de Peças ST92195C6
Descrição Electrónicos  48-96 Kbyte ROM HCMOS MCU WITH ON-SCREEN DISPLAY AND TELETEXT DATA SLICER
Download  249 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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ST92195C/D - GENERAL DESCRIPTION
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST92195C and ST92195D microcontrollers
are developed and manufactured by STMicroelec-
tronics using a proprietary n-well HCMOS proc-
ess. Their performance derives from the use of a
flexible 256-register programming model for ultra-
fast context switching and real-time event re-
sponse. The intelligent on-chip peripherals offload
the ST9 core from I/O and data management
processing tasks allowing critical application tasks
to get the maximum use of core resources. The
ST92195C/D MCU support low power consump-
tion and low voltage operation for power-efficient
and low-cost embedded systems.
1.1.1 ST9+ Core
The advanced Core consists of the Central
Processing Unit (CPU), the Register File and the
Interrupt controller.
The general-purpose registers can be used as ac-
cumulators, index registers, or address pointers.
Adjacent register pairs make up 16-bit registers for
addressing or 16-bit processing. Although the ST9
has an 8-bit ALU, the chip handles 16-bit opera-
tions, including arithmetic, loads/stores, and mem-
ory/register and memory/memory exchanges.
Two basic addressable spaces are available: the
Memory space and the Register File, which in-
cludes the control and status registers of the on-
chip peripherals.
1.1.2 Power Saving Modes
To optimize performance versus power consump-
tion, a range of operating modes can be dynami-
cally selected.
Run Mode. This is the full speed execution mode
with CPU and peripherals running at the maximum
clock speed delivered by the Phase Locked Loop
(PLL) of the Clock Control Unit (CCU).
Wait For Interrupt Mode. The Wait For Interrupt
(WFI) instruction suspends program execution un-
til an interrupt request is acknowledged. During
WFI, the CPU clock is halted while the peripherals
and interrupt controller keep running at a frequen-
cy programmable via the CCU. In this mode, the
power consumption of the device can be reduced
by more than 95% (Low power WFI).
Halt Mode. When executing the HALT instruction,
and if the Watchdog is not enabled, the CPU and
its peripherals stop operating and the status of the
machine
remains frozen
(the
clock is
also
stopped). A reset is necessary to exit from Halt
mode.
1.1.3 I/O Ports
Up to 28 I/O lines are dedicated to digital Input/
Output. These lines are grouped into up to five I/O
Ports and can be configured on a bit basis under
software control to provide timing, status signals,
timer and output, analog inputs, external interrupts
and serial or parallel I/O.
1.1.4 TV Peripherals
A set of on-chip peripherals form a complete sys-
tem for TV set and VCR applications:
– Voltage Synthesis
– VPS/WSS Slicer
– Teletext Slicer
– Teletext Display RAM
– OSD
1.1.5 On Screen Display
The human interface is provided by the On Screen
Display module, this can produce up to 26 lines of
up to 80 characters from a ROM of two 512-char-
acter sets. The character resolution is 10x10 dot.
Four character sizes are supported. Serial at-
tributes allow the user to select foreground and
background colors, character size and fringe back-
ground. Parallel attributes can be used to select
additional foreground and background colors and
underline on a character by character basis.
1.1.6 Teletext and Display Storage RAM
The internal Teletext and Display storage RAM
can be used to store Teletext pages as well as Dis-
play parameters.


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