ST52F513G3M6 STMicroelectronics, ST52F513G3M6 Datasheet - Page 46

• Manufacturer Part Number: ST52F513G3M6
• Manufacturer: STMicroelectronics

Specifications of ST52F513G3M6

• Cpu Family: ST52
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: I2C/SCI/SPI
• Program Memory Type: Flash
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 22
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Package Type: SO
• Lead Free Status / Rohs Status: Compliant

ST52510xx ST52513xx
6 CLOCK, RESET & POWER SAVING MODES
6.1 Clock
The ST52F510/F513 Clock Generator module
generates the internal clock for the internal Control
Unit, ALU and on-chip peripherals. The Clock is
designed to require a minimum of external
components.
ST52F510/F513 devices supply the internal
oscillator in four clock modes:
■
■
■
The device always starts in internal clock mode,
excluding any external clock source. After the
start-up phase the clock is configured according to
the user definition programmed in the Option Byte
0 (OSC_CR). The internal clock generator can
supply an internal clock signal with a fixed
frequency of 10 MHz ± 1%, without the need for
external components. In order to obtain the
maximum accuracy, the frequency can be
calibrated by configuring the related Option byte 2
(OSC_SET).
The external oscillator mode uses a quartz crystal
or a ceramic resonator connected to OSCin and
OSCout as illustrated in
illustrates the connection of an external clock.
Figure 6.1 Oscillator Connections
46/136
External oscillator
External clock
Internal clock
Cl1
10pF
OSCin
Figure
CRYSTAL CLOCK
ST FIVE
6.1. This figure also
OSCout
Cl2
10pF
The ST52F510/F513 oscillator circuit generates an
internal clock signal with the same period and
phase as the OSCIN input pin. The maximum
frequency allowed is 20 MHz.
When the external oscillator is used, the loop gain
can be adapted to the various frequencies values
by configuring the three bits of the Option Byte 1
CLK_SET (see Register Description,
When an external clock is used, it must be
connected to the pin OSCIN while OSCOUT can
be floating. In this case, Option Byte 1 bits must be
written with 0 (000).
The crystal oscillator start-up time is a function of
many variables: crystal parameters (especially
R
parameters, environment temperature and supply
voltage.
The
connections must be as short as possible. Typical
values for CL1, CL2 are 10pF for a 20 MHz crystal.
Figure 6.1
The clock signal generates two internal clock
signals: one for the CPU and one for the
peripherals. The CPU clock frequency can be
reduced,
consumption,
Configuration Register 46 (02Eh). The CPU clock
can be reduced up to 64 times (see Register
Description).
s
),
crystal
oscillator
OSCin
CLOCK
INPUT
illustrates the possible connections.
in
EXTERNAL CLOCK
or
ST FIVE
order
by
load
ceramic
setting
capacitance
to
OSCout
leads
decrease
the
Table
and
CPU_CLK
(CL),
current
6.1).
circuit
IC