ST7FOXK1 STMicroelectronics, ST7FOXK1 Datasheet - Page 130

• Manufacturer Part Number: ST7FOXK1
• Description: Low cost flash 8bit micro
• Manufacturer: STMicroelectronics

Specifications of ST7FOXK1

• 4 To 8 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 1K write/erase cycles guaranteed Data retention
• 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: up to 10 input channels

On-chip peripherals
Note:
130/226
There is a locking mechanism for transferring the OCiR value to the buffer. After a write to
the OCiHR register, transfer of the new compare value to the buffer is inhibited until OCiLR
is also written.
Unlike in output compare mode, the compare function is always enabled in PWM mode.
Procedure
To use pulse width modulation mode:
1.
2.
3.
4.
Figure 68. Pulse width modulation cycle
If OLVL = 1 and OLVL2 = 0 the length of the positive pulse is the difference between the
OC2R and OC1R registers.
If OLVL1 = OLVL2 a continuous signal is seen on the OCMP1 pin.
Load the OC2R register with the value corresponding to the period of the signal using
the formula in the opposite column.
Load the OC1R register with the value corresponding to the period of the pulse if
(OLVL1 = 0 and OLVL2 = 1) using
Select the following in the CR1 register:
Using the OLVL1 bit, select the level to be applied to the OCMP1 pin after a successful
comparison with OC1R register.
Using the OLVL2 bit, select the level to be applied to the OCMP1 pin after a successful
comparison with OC2R register.
Select the following in the CR2 register:
Set OC1E bit: the OCMP1 pin is then dedicated to the output compare 1 function.
Set the PWM bit.
Select the timer clock (CC[1:0])
= OC1R
= OC2R
counter
counter
When
When
(see: Timer A Control register 2 (TACR2) on page
Pulse width modulation cycle
Equation
OCMP1 = OLVL2
OCMP1 = OLVL1
Counter is reset
5.
ICF1 bit is set
to FFFCh
ST7FOXF1, ST7FOXK1, ST7FOXK2
134).