ST6252C STMicroelectronics, ST6252C Datasheet - Page 44

• Manufacturer Part Number: ST6252C
• Description: 8 Bit ST6 Microcontroller with 4x8-bitADC 1x8-bit TIMER, 1x8-bitAR TIMER
• Manufacturer: STMicroelectronics

Specifications of ST6252C

• Data Ram: 128 bytes
• Data Eeprom: 64 bytes (none on ST62T52C)

ST6252C ST6262B ST6262C
AUTO-RELOAD TIMER (Cont’d)
It should be noted that the reload values will also
affect the value and the resolution of the duty cycle
of PWM output signal. To obtain a signal on ARTI-
Mout, the contents of the ARCP register must be
greater than the contents of the ARRC register.
The maximum available resolution for the ARTI-
Mout duty cycle is:
Where ARRC is the content of the Reload/Capture
register. The compare value loaded in the Com-
pare Register, ARCP, must be in the range from
(ARRC) to 255.
Figure 28. Auto-reload Timer PWM Function
44/75
PWM OUTPUT
COMPARE
VALUE
REGISTER
COUNTER
RELOAD
Resolution = 1/[256-(ARRC)]
255
000
t
HIGH
t
LOW
The ARTC counter is initialized by writing to the
ARRC register and by then setting the TCLD (Tim-
er Load) and the TEN (Timer Clock Enable) bits in
the Mode Control register, ARMC.
Enabling and selection of the clock source is con-
trolled by the CC0, CC1, SL0 and SL1 bits in the
Status Control Register, ARSC1. The prescaler di-
vision ratio is selected by the PS0, PS1 and PS2
bits in the ARSC1 register.
In Auto-reload Mode, any of the three available
clock sources can be selected: Internal Clock, In-
ternal Clock divided by 3 or the clock signal
present on the ARTIMin pin.
VR001852
t
t