ST9291 ST Microelectronics, ST9291 Datasheet - Page 4

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

ST9291
GENERAL DESCRIPTION (Continued)
The control of TV or Satellite receiver setting can
be done by up to eight 8-bit PWM outputs, with a
frequency maximum of 23,437Hz at 8-bit resolu-
tion (INTCLK = 12MHz). Low resolutions with
higher frequency operation can be programmed.
In addition thereis a 3 channelAnalog to Digital Con-
verter with integral sample and hold, fast 5.75 s con-
version time and 6-bit guaranteedresolution.
PIN DESCRIPTION
VSYNC. Vertical Sync. Vertical video synchronisa-
tion input to OSD. Positive or negative polarity.
HSYNC. Horizontal Sync. Horizontal video syn-
chronisation input to OSD. Positive or negative po-
larity.
PLLF. PLL Filter input. Filter input for the OSD for
PLL feed-back.
PLLR. PLL Resistor connection pin. For resistor
connection to select the PLL gain adjust.
RESET. Reset (input, active low). The ST9 is initial-
ised by the Reset signal. With the deactivationof RE-
SET, program execution begins from the Program
memory location pointed to by the vector contained
in program memory locations 00h and 01h.
OSCIN, OSCOUT. Oscillator (input and output).
These pins connect a parallel-resonant crystal
4/20
(24MHz maximum), or an external source to the
on-chip clock oscillator and buffer. OSCIN is the in-
put of the oscillator inverter and internal clock gen-
erator; OSCOUT is the output of the oscillator
inverter.
AV
V
V
V
P0.0-P0.7, P2.0-P2.5, P3.0-P3.7, P4.0-P4.7,
P5.0-P5.1 (J suffix)
P0.0-P0.7, P1.0-P1.7, P2.0-P2.5, P3.0-P3.7,
P4.0-P4.7, P5.0-P5.3 (N suffix) I/O Port Lines (In-
put/Output, TTL or CMOS compatible). 32/42 lines
grouped into I/O ports, bit programmable under
program control as general purpose I/O or as Alter-
nate functions (see next section).
P4.0 - P4.7 are high voltage (12V) open drain out-
puts. The voltage in open drain output mode for all
other I/O bits must not exceed V
I/O Port Alternate Functions.
Each pin of the I/O ports of the ST9291 may as-
sume software programmable Alternative Func-
tions as shown in the Pin Configuration Drawings.
Table 1 shows the Functions allocated to each I/O
Port pin.
DD
DD
SS
DD
. Digital Circuit Ground.
. Main Power Supply Voltage (5V 10%)
externally to the ST9291.
. Analog V
DD
of PLL. This pin must be tied to
DD
.