ST7LITE49M STMicroelectronics, ST7LITE49M Datasheet - Page 90

• Manufacturer Part Number: ST7LITE49M
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49M

• 4 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 10k write/erase cycles guaranteed Data retention
• 128 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow
• A/d Converter: 10 input channels

On-chip peripherals
Note:
90/188
How to enter One-pulse mode
The steps required to enter One-pulse mode are the following:
1.
2.
3.
4.
5.
6.
7.
8.
9.
The "Wait for Overflow" in step 6 can be replaced by a forced update.
Follow the same procedure for PWM2 with the bits corresponding to PWM2.
When break is applied in One-pulse mode, CNTR2, DCR2/3 & ATR2 registers are reset. So,
these registers have to be initialized again when break is removed.
Figure 49. Block diagram of One-pulse mode
Figure 50. One-pulse mode and PWM timing diagram
LTIC pin
PWM3CSR register
Load ATR2H/ATR2L with required value.
Load DCR3H/DCR3L for PWM3. ATR2 value must be greater than DCR3.
Set OP3 in PWM3CSR if polarity change is required.
Select CNTR2 by setting ENCNTR2 bit in ATCSR2.
Set TRAN2 bit in ATCSR2 to enable transfer.
"Wait for Overflow" by checking the OVF2 flag in ATCSR2.
Select counter clock using CK<1:0> bits in ATCSR.
Set OP_EN bit in PWM3CSR to enable one-pulse mode.
Enable PWM3 by OE3 bit of PWMCR.
Note 1: When OP_EN=0, LTIC edges are not taken into account as the timer runs in PWM mode.
f
f
counter2
counter2
CNTR2
LTIC
CNTR2
PWM2/3
LTIC
PWM2/3
Edge
Selection
OPEDGE
OVF
ATR2
000
OP_EN
Doc ID 13562 Rev 3
DCR2/3
DCR2/3
12-bit AutoReload register 2
12-bit Active DCR2/3
OVF
12-bit Upcounter 2
ATR2
000
OP2/3
DCR2/3
DCR2/3
Generation
PWM
OVF
ST7LITE49M
ATR2
ATR2
000
PWM2/3