ST92F124R9TB STMicroelectronics, ST92F124R9TB Datasheet - Page 129
![IC MCU 8BIT 64K MEMORY 64-LQFP](/photos/12/15/121504/stmicroelectronics-64-lqfp_sml.jpg)
ST92F124R9TB
Manufacturer Part Number
ST92F124R9TB
Description
IC MCU 8BIT 64K MEMORY 64-LQFP
Manufacturer
STMicroelectronics
Series
ST9r
Datasheet
1.ST92F150CV1TB.pdf
(429 pages)
Specifications of ST92F124R9TB
Core Processor
ST9
Core Size
8/16-Bit
Speed
24MHz
Connectivity
I²C, SCI, SPI
Peripherals
DMA, LVD, POR, PWM, WDT
Number Of I /o
48
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 16x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 105°C
Package / Case
64-LQFP
Processor Series
ST92F12x
Core
ST9
Data Bus Width
8 bit, 16 bit
Data Ram Size
6 KB
Interface Type
CAN, I2C, SCI, SPI
Maximum Clock Frequency
24 MHz
Number Of Programmable I/os
80
Number Of Timers
16 bit
Operating Supply Voltage
4.5 V to 5.5 V
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Development Tools By Supplier
ST92F150-EPB
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ST92F124R9TB
Manufacturer:
STMicroelectronics
Quantity:
10 000
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CLOCK MANAGEMENT (Cont’d)
7.3.1 PLL Clock Multiplier Programming
The CLOCK1 signal generated by the oscillator
drives a programmable divide-by-two circuit. If the
DIV2 control bit in MODER is set (Reset Condi-
tion), CLOCK2, is equal to CLOCK1 divided by
two; if DIV2 is reset, CLOCK2 is identical to
CLOCK1. Since the input clock to the Clock Multi-
plier circuit requires a 50% duty cycle for correct
PLL operation, the divide by two circuit should be
enabled when a crystal oscillator is used, or when
the external clock generator does not provide a
50% duty cycle. In practice, the divide-by-two is
virtually always used in order to ensure a 50% duty
cycle signal to the PLL multiplier circuit.
When the PLL is active, it multiplies CLOCK2 by 6,
8, 10 or 14, depending on the status of the MX[0:1]
bits in PLLCONF. The multiplied clock is then di-
vided by a factor in the range 1 to 7, determined by
the status of the DX[0:2] bits; when these bits are
programmed to 111, the PLL is switched off.
Following a RESET phase, programming bits
DX0-2 to a value different from 111 will turn the
PLL on. After allowing a stabilization period for the
PLL,
CLK_FLAG Register selects the multiplier clock.
The RCCU contains a frequency comparator be-
tween CLOCK2 and the PLL clock output that ver-
ifies if the PLL reaches the programmed frequency
and has stabilized (locked status). When this con-
dition occurs, the LOCK bit in the CLK_FLAG reg-
ister is set to 1 by hardware and this value is main-
tained as long as the PLL is locked. The LOCK bit
is set back to 0 if for some reason (change of MX
bit value, stop and restart of PLL or CLOCK2,
etc.), the PLL loses the programmed frequency in
which it was locked.
The PLL selection as system clock is further con-
ditioned by the status of the Voltage Regulator:
when it is not providing a stabilized supply voltage,
the PLL cannot be selected.
The maximum frequency allowed for INTCLK is
24 MHz. Care is required, when programming the
PLL multiplier and divider factors, not to exceed
the maximum permissible operating frequency for
INTCLK, according to supply
in Electrical Characteristics section.
setting
the
CSU_CKSEL
ST92F124/F150/F250 - RESET AND CLOCK CONTROL UNIT (RCCU)
voltage,
bit
as reported
in
the
The ST9 being a static machine, there is no lower
limit for INTCLK. However, some peripherals have
their own minimum internal clock frequency limit
below which the functionality is not guaranteed.
7.3.2 PLL Free Running Mode
The PLL is able to provide a 50-kHz clock, usable
to slow program execution. This mode is
controlled by the FREEN and DX[2:0] bits in the
PLLCONF register: when the PLL is off and the
FREEN bit is set to 1 (i.e. when the FREEN and
DX[2:0] bits are set to 1), the PLL provides this
clock. The selection of this clock is also managed
by the CSU_CKSEL bit but is not conditioned by
the LOCK bit. To avoid unpredictable behaviour of
the PLL clock, Free Running mode must be set
and reset by the user only when the PLL clock is
not the system clock, i.e. when the CSU_CKSEL
bit is reset.
In addition, when the PLL provides the internal
clock, if the clock signal disappears (for instance
due to a broken or disconnected resonator...), a
safety clock signal is automatically provided, al-
lowing the ST9 to perform some rescue opera-
tions.
Typ. Safety clock frequency = 800 kHz / Div,
where Div depends on the DX[0..2] bits of the PLL-
CONF register (R246, page55).
Table 26. Free Running Clock Frequency
DX2
0
0
0
0
1
1
1
1
1
DX1
0
0
1
1
0
0
1
1
1
DX0
0
1
0
1
0
1
0
1
1
DIV
10
12
14
16
2
4
6
8
-
(CSU_CKSEL=0;
(CSU_CKSEL=0;
FREEN=1)
FREEN=0)
CK (Typ.)
CLOCK2
400 kHz
200 kHz
133 kHz
100 kHz
80 kHz
67 kHz
57 kHz
50 kHz
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