ST72651AR6 STMicroelectronics, ST72651AR6 Datasheet - Page 90
ST72651AR6
Manufacturer Part Number
ST72651AR6
Description
LOW-POWER, FULL-SPEED USB 8-BIT MCU WITH 32K FLASH, 5K RAM, FLASH CARD I/F, TIMER, PWM, ADC, I2C, SPI
Manufacturer
STMicroelectronics
Datasheet
1.ST72651AR6.pdf
(161 pages)
Specifications of ST72651AR6
Dual Supply Management
analog voltage detector on the USB power line to enable smart power switching from USB power to battery (on E suffix devices).
Programmable Internal Voltage Regulator For Memory Cards (2.8v To 3.5v) Supplying
Flash Card I/O lines (voltage shifting)
5 Usb Endpoints
1 control endpoint
Dtc (data Transfer Coprocessor)
Universal Serial/Parallel communications interface, with software plug-ins for current and future protocol standards
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ST72651AR6
PWM/BRM GENERATOR (Cont’d)
BRM Generation
The BRM bits allow the addition of a pulse to wid-
en a standard PWM pulse for specific PWM cy-
cles. This has the effect of “fine-tuning” the PWM
Duty cycle (without modifying the base duty cycle),
thus, with the external filtering, providing additional
fine voltage steps.
The incremental pulses (with duration of T
added to the beginning of the original PWM pulse.
The PWM intervals which are added to are speci-
fied in the 4-bit BRM register and are encoded as
shown in the following table. The BRM values
shown may be combined together to provide a
summation of the incremental pulse intervals
specified.
The pulse increment corresponds to the PWM res-
olution.
For example, if
– Data 18h is written to the PWM register
– Data 06h (00000110b) is written to the BRM reg-
– with a 8MHz internal clock (125ns resolution)
Then 3.0 μs-long pulse will be output at 8 μs inter-
vals, except for cycles numbered 2,4,6,10,12,14,
where the pulse is broadened to 3.125 μs.
Figure 51. BRM pulse addition (PWM > 0)
90/161
ister
T
m = 0
CPU
x 64
T
m = 1
CPU
x 64
CPU
Doc ID 7215 Rev 4
T
) are
CPU
T
m = 2
CPU
x 64 increment
x 64
Note. If 00h is written to both PWM and BRM reg-
isters, the generator output will remain at “0”. Con-
versely, if both registers hold data 3Fh and 0Fh,
respectively, the output will remain at “1” for all in-
tervals 1 to 15, but it will return to zero at interval 0
for an amount of time corresponding to the PWM
resolution (T
An output can be set to a continuous “1” level by
clearing the PWM and BRM values and setting
POL = “1” (inverted polarity) in the PWM register.
This allows a PWM/BRM channel to be used as an
additional I/O pin if the DAC function is not re-
quired.
Table 30. Bit BRM Added Pulse Intervals
(Interval #0 not selected).
BRM 4 - Bit Data
0000
0001
0010
0100
1000
CPU
).
none
i = 8
i = 4,12
i = 2,6,10,14
i = 1,3,5,7,9,11,13,15
Incremental Pulse Intervals
T
m = 15
CPU
x 64
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