ST7FLITE39F2M6TR STMicroelectronics, ST7FLITE39F2M6TR Datasheet - Page 64

• Manufacturer Part Number: ST7FLITE39F2M6TR
• Description: IC MCU 8BIT 8K FLASH 20SOIC
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST7FLITE39F2M6TR

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: LINSCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 7x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (7.5mm Width)
• Processor Series: ST7FLITE3x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 384 B
• Interface Type: LINSCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST7FLITE-SK/RAIS, ST7MDT10-DVP3, ST7MDT10-EMU3, STX-RLINK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 7 Channel
• For Use With: 497-8406 - BOARD STF20NM50FD/STF7LITE39BF2497-8403 - BOARD DEMO STCC08 AC SW DETECTOR497-5858 - EVAL BOARD PLAYBACK ST7FLITE497-5049 - KIT STARTER RAISONANCE ST7FLITE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ST7LITE3xF2
DUAL 12-BIT AUTORELOAD TIMER 3 (Cont’d)
■
Pulses that last between 8µs and 2s can be meas-
ured with an accuracy of 4µs if f
following conditions:
– The 12-bit AT3 Timer is clocked by the Lite Timer
– The ICS bit in the ATCSR2 register is set so that
Figure 44. Long Range Input Capture Block Diagram
Notes:
1. Since the input capture flags (ICF) for both tim-
ers (AT3 Timer and LT Timer) are set when signal
transition occurs, software must mask one inter-
rupt by clearing the corresponding ICIE bit before
setting the ICS bit.
2. If the ICS bit changes (from 0 to 1 or from 1 to
0), a spurious transition might occur on the input
capture signal because of different values on LTIC
and ATIC. To avoid this situation, it is recommend-
ed to do as follows:
– First, reset both ICIE bits.
– Then set the ICS bit.
– Reset both ICF bits.
64/173
1
ATIC
LTIC
(RTC pulse: CK[1:0] = 01 in the ATCSR register)
the LTIC pin is used to trigger the AT3 Timer cap-
ture.
Long input capture
ICS
1
0
f
LTIMER
f
OFF
cpu
f
OSC/32
LTICR
OSC
CNTR1
ATR1
ATICR
12-bit Input Capture Register
12-bit AutoReload Register
8-bit Input Capture Register
= 8MHz in the
8-bit Timebase Counter1
12-bit Upcounter1
– The signal to be captured is connected to LTIC
– Input Capture registers LTICR, ATICRH and
This configuration allows to cascade the Lite Timer
and the 12-bit AT3 Timer to get a 20-bit input cap-
ture value. Refer to
– And then set the ICIE bit of desired interrupt.
3. How to compute a pulse length with long input
capture feature.
As both timers are used, computing a pulse length
is not straight-forward. The procedure is as fol-
lows:
– At the first input capture on the rising edge of the
Refer to
pin
ATICRL are read
pulse, we assume that values in the registers are
as follows:
LTICR = LT1
ATICRH = ATH1
ATICRL = ATL1
Hence ATICR1 [11:0] = ATH1 & ATL1
12-Bit ARTIMER
LITE TIMER
Figure 45 on page
Figure
8 LSB bits
12 MSB bits
44.
65.
20
cascaded
bits