ST72F325K4T6 STMicroelectronics, ST72F325K4T6 Datasheet - Page 77

• Manufacturer Part Number: ST72F325K4T6
• Description: MCU 8BIT 16KB FLASH/ROM 32-LQFP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72F325K4T6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 24
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 3.8 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Processor Series: ST72F3x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: I2C, SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST7232X-EVAL, ST7232X-SK/RAIS, ST72325-D/RAIS, ST7MDT20-DVP3, ST7MDT20J-EMU3, ST7MDT20M-EMU3, STX-RLINK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• For Use With: 497-5046 - KIT TOOL FOR ST7/UPSD/STR7 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 497-5605

16-BIT TIMER (Cont’d)
10.4.3.3 Input Capture
In this section, the index, i, may be 1 or 2 because
there are two input capture functions in the 16-bit
timer.
The two 16-bit input capture registers (IC1R and
IC2R) are used to latch the value of the free run-
ning counter after a transition is detected on the
ICAPi pin (see
ICiR register is a read-only register.
The active transition is software programmable
through the IEDGi bit of Control Registers (CRi).
Timing resolution is one count of the free running
counter: (
Procedure:
To use the input capture function select the follow-
ing in the CR2 register:
– Select the timer clock (CC[1:0]) (see
– Select the edge of the active transition on the
And select the following in the CR1 register:
– Set the ICIE bit to generate an interrupt after an
– Select the edge of the active transition on the
ICAP2 pin with the IEDG2 bit (the ICAP2 pin
must be configured as floating input or input with
pull-up without interrupt if this configuration is
available).
input capture coming from either the ICAP1 pin
or the ICAP2 pin
ICAP1 pin with the IEDG1 bit (the ICAP1pin must
be configured as floating input or input with pull-
up without interrupt if this configuration is availa-
ble).
ICiR
f
CPU
/
Figure
CC[1:0]).
MS Byte
ICiHR
5).
LS Byte
ICiLR
Table
1).
When an input capture occurs:
– ICFi bit is set.
– The ICiR register contains the value of the free
– A timer interrupt is generated if the ICIE bit is set
Clearing the Input Capture interrupt request (that
is, clearing the ICFi bit) is done in two steps:
1. Reading the SR register while the ICFi bit is set.
2. An access (read or write) to the ICiLR register.
Notes:
1. After reading the ICiHR register, transfer of
2. The ICiR register contains the free running
3. The two input capture functions can be used
4. In One Pulse mode and PWM mode only Input
5. The alternate inputs (ICAP1 and ICAP2) are
6. The TOF bit can be used with interrupt genera-
running counter on the active transition on the
ICAPi pin (see
and the I bit is cleared in the CC register. Other-
wise, the interrupt remains pending until both
conditions become true.
input capture data is inhibited and ICFi will
never be set until the ICiLR register is also
read.
counter value which corresponds to the most
recent input capture.
together even if the timer also uses the two out-
put compare functions.
Capture 2 can be used.
always directly connected to the timer. So any
transitions on these pins activates the input
capture function.
Moreover if one of the ICAPi pins is configured
as an input and the second one as an output,
an interrupt can be generated if the user tog-
gles the output pin and if the ICIE bit is set.
This can be avoided if the input capture func-
tion i is disabled by reading the ICiHR (see note
1).
tion in order to measure events that go beyond
the timer range (FFFFh).
Figure
6).
ST72325xx
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