ST9293 ST Microelectronics, ST9293 Datasheet - Page 3

• Manufacturer Part Number: ST9293
• Description: 48K ROM HCMOS MCUs WITH ON SCREEN DISPLAY AND A/D CONVERTER
• Manufacturer: ST Microelectronics

1.2 PIN DESCRIPTION
VSYNC. Vertical Synch. Vertical video synchroni-
sation input to OSD. Positive or negative polarity.
HSYNC. Horizontal Synch. 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 ini-
tialised by the Reset signal. With the deactivation
of RESET, program execution begins from the Pro-
gram 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
(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.
Table 1-1. ST9293 I/O Port Alternate Function Summary
I/O PORT
Port.bit
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P2.0
P2.1
P2.2
INT6
INT7
INT0
Name
Function
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
I
External Interrupt 6
External Interrupt 7
External Interrupt 0
AV
V
V
V
be connected together externally to the ST9293.
P0.0-P0.7, P2.0-P2.7, P3.3-P3.7, P4.5-P4.7,
P5.0-P5.6 I/O Port Lines (Input/Output, TTL or
CMOS compatible). 31 lines grouped into I/O
ports, bit programmable under program control as
general purpose I/O or as Alternate functions (see
next section).
P3.3 and P3.4 are true 12V open drain outputs
when set in output mode.
1.2.1 I/O Port Alternate Functions.
Each pin of the I/O ports of the ST9293 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
, V
Alternate Function
. Main Power Supply Voltage (5V 10%)
externally to the ST9293.
. Analog V
SS2
. Digital Circuit Ground, these pins must
DD
of PLL. This pin must be tied to
Assignment
9293J
Pin
ST9293
12
11
10
39
40
41
9
8
7
6
5
3/4