ST92195B datasheet(2/22 Pages) STMICROELECTRONICS

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ST92195B - GENERAL DESCRIPTION

1 GENERAL DESCRIPTION

1.1 INTRODUCTION

The ST92195B microcontroller is developed and

manufactured by STMicroelectronics using a pro-

prietary n-well HCMOS process. Its performance

derives from the use of a flexible 256-register pro-

gramming model for ultra-fast context switching

and real-time event response. The intelligent on-

chip peripherals offload the ST9 core from I/O and

data management processing tasks allowing criti-

cal application tasks to get the maximum use of

core resources. The ST92195B MCU supports low

power consumption 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 peripheral

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 defined 512 char-

acter set. 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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