ST52T440F3M6 STMicroelectronics, ST52T440F3M6 Datasheet - Page 18

• Manufacturer Part Number: ST52T440F3M6
• Description: MCU 8-Bit ST52 CISC 8KB EPROM 5V 20-Pin SO
• Manufacturer: STMicroelectronics

Specifications of ST52T440F3M6

• Package: 20SO
• Family Name: ST52
• Maximum Speed: 20 MHz
• Ram Size: 256 Byte
• Program Memory Size: 8 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: EPROM
• Number Of Programmable I/os: 13
• On-chip Adc: 6-chx12-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 1

ST52T400/T440/E440/T441
1.3 Pin Description
ST52x400/440/441 pins can be set in digital input
mode, digital output mode or in Alternate Func-
tions. The pin configuration is achieved by means
of the configuration registers. The functions of the
ST52x400/440/441 pins are described below:
V
V
connected to ground (see ST52T400 pin-out).
GNDA. Analog circuit ground of the Analog Com-
parator. Must be tied to V
V
gramming and MODE selector. During the Pro-
gramming phase V
Working phase V
OSCin and OSCout. These pins are internally
connected to the on-chip oscillator circuit. A quartz
crystal or a ceramic resonator can be connected
between these two pins in order to allow the cor-
rect operations of ST52x400/440/441 with various
stability/cost trade-offs. An external clock signal
can be applied to OSCin: in this case OSCout
must be grounded.
RESET. This signal is used to reset the
ST52x400/440/441 and re-initialize the registers
and control signals. It also allows the user to
select the working mode of the device.
PA0-PA7, PB0-PB7,PC0-PC4. These lines are
organized as I/O ports. Each pin can be config-
ured as an input or output. During the Program-
ming phase the ports are used for EPROM data
read/write operations.
AC0-AC5(*). These pins are used to input the
analog signals to the Analog Comparator. An ana-
log multiplexer is available to switch these inputs
to the Analog Comparator.
CS(*). This pin outputs the current generated in
the Analog Comparator peripheral by a current
generator, allowing charging of an external capac-
itor to obtain a voltage ramp for the A/D conver-
sion.
18/94
DD.
SS
PP
. Main Power Supply for internal EPROM pro-
. Digital circuit Ground. All Vss pins must be
Main Power Supply Voltage (5V
PP
PP
must be equal to V
must be set at 12V. In the
SS
.
SS
10%).
.
ACSTRT, ACSYNC(*). These pins are used to
synchronize the 16-bit counter of the Analog Com-
parator with an external ramp generator. The
ACSTRT input is used to start the counter. The
ACSYNC output is set when the counter is ready
to start a new count.
BG(*). A Bandgap Reference value of 2.5V is
available on this pin. It can be used for analog sig-
nal conditioning.
TOUT, TOUTN.These pins output the signal gen-
erated by the TIMER peripheral. The T0OUTN
signal is the complement of the T0OUT one.
TRES, TSTRT, TCLK . These pins are related to
the TIMER peripheral and are used for Input Cap-
ture and event counting. The TRES pin is used to
set/reset the Timer; the TSTRT pin is used to start/
stop the counter. The Timer can be driven by the
internal clock or by an external signal connected
to the TCLK pin.
TROUT, MAIN1, MAIN2. These pins are related to
the TRIAC DRIVER peripheral. TROUT outputs
the signal generated by the peripheral. In order to
drive a TRIAC directly without the use of addi-
tional components, the TROUT pin can supply up
to 50 mA (2V voltage drop). MAIN1 and MAIN2
pins are used to detect the zero crossing of the
Power Line voltage.
(*) Not available in ST52x400 devices