参数资料
型号: ST72F652R4T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 153/160页
文件大小: 974K
代理商: ST72F652R4T1
ST7265
92/160
PWM/BRM GENERATOR (Cont’d)
Figure 56. Precision for PWM/BRM Tuning for VOUTEFF (After filtering)
11.6.4 Register Description
On a channel basis, the 10 bits are separated into
two data registers:
Note: The number of PWM and BRM channels
available depends on the device. Refer to the de-
vice pin description and register map.
PULSE BINARY WEIGHT REGISTERS (PWMi)
Read / Write
Reset Value 1000 0000 (80h)
Bit 7 = Reserved (Forced by hardware to “1”)
Bit 6 = POL
Polarity Bit for channel i.
0: The channel
i outputs a “1” level during the bina-
ry pulse and a “0” level after.
1: The channel
i outputs a “0” level during the bina-
ry pulse and a “1” level after.
Bit 5:0 = P[5:0]
PWM Pulse Binary Weight for
channel i.
This register contains the binary value of the pulse.
BRM REGISTERS
Read / Write
Reset Value: 0000 0000 (00h)
These registers define the intervals where an in-
cremental pulse is added to the beginning of the
original PWM pulse. Two BRM channel values
share the same register.
Bit 7:4 = B[7:4]
BRM Bits (channel i+1).
Bit 3:0 = B[3:0]
BRM Bits (channel i)
Note: From the programmer’s point of view, the
PWM and BRM registers can be regarded as be-
ing combined to give one data value.
For example
:
Effective (with external RC filtering) DAC value
70
1
POL
P5
P4
P3
P2
P1
P0
70
B7
B6
B5
B4
B3
B2
B1
B0
1
POL
PP
+
B
BBB
1
POL
PPP
BBB
B
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