ST9291 ST Microelectronics, ST9291 Datasheet - Page 3

• Manufacturer Part Number: ST9291
• Description: 16-48K ROM HCMOS MCU WITH ON SCREEN DISPLAY AND VOLTAGE TUNINGOUTPUT
• Manufacturer: ST Microelectronics

GENERAL DESCRIPTION
The ST9291 is a ROM member of the ST9 family of
microcontrollers, completely developed and pro-
duced by SGS-THOMSON Microelectronics using
a proprietary n-well HCMOS process.
The ROM parts are fully compatible with their
EPROM and OTP (One-Time Programmable) ver-
sions, which may be used for the prototyping and
pre-production phases of development.
The nucleus of the ST9291 is the advanced ST9
Core which includes the Central Processing Unit
(CPU), the Register File, a 16-bit Timer/Watchdog
with 8-bit Prescaler, a Serial Peripheral Interface
supporting S-bus, I
plus two 8-bit I/O ports. The Core has independent
memory and register buses allowing a high degree
of pipelining to add to the efficiency of the code
execution speed of the extensive instruction set.
The powerful I/O capabilities demanded by micro-
controller applications are fulfilled by the ST9291
with up to 32/42 I/O lines dedicated to digital In-
put/Output. These lines are grouped into up to six
I/O Ports and can be configured on a bit basis un-
der software control to provide timing, status sig-
Figure 3. ST9291 Block Diagram
Note 1. EPROM version only
ROM or EPROM
16 k / 48 k Bytes
I/O PORT 0
Note : 42 SDIP shown
8
(1)
384 / 640 Bytes
2
MEMORY BUS ( Address & Data )
C-bus and IM-bus Interface,
RAM
( Analog Inputs )
I/O PORT 2
6
REGISTER FILE
Converter
256 Bytes
A / D
REGISTER BUS ( Address & Data )
I/O PORT
3
7
16-Bit TIMER/WATCHDOG+SPI
nals, timer inputs and outputs, analog inputs, ex-
ternal interrupts, OSD (On Screen Display) output
and serial or parallel I/O.
Three basic memory spaces are available to sup-
port this wide range of configurations: Program
Memory, Data Memory and the Register File,
which includes the control and status registers of
the on-chip peripherals.
The human interface is provided by the On Screen
Display module, this can produce up to 15 lines of
up to 34 characters from a ROM defined 128 char-
acter set. The 9x13 character can be modified by 4
different pixel sizes, with character rounding, and
formed into words with colour and format attrib-
utes.
A 14-bit VS (Voltage Synthesis) output using the
PWM (Pulse Width Modulation)/BRM (Bit Rate
Modulation) is present to generate tuning voltages
for low-mid range TV set applications. The tuning
voltage is output on one of two separate output
pins.
A 16-bit Slice Timer with an 8-bit Prescaler is also
present.
VSYNC
On Screen
HSYNC
Display
CPU
PLL
PLLR
PLLF
AV
I/O PORT 4
Outputs
P.W.M.
DD
8
TIMER
SLICE
Converter
P.W.M.
D / A
VR01995E
SYNTHESIS
VOLTAGE
I/O PORT 5
( SPI )
ST9291
2
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