参数资料
型号: ST72774S9T1/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
封装: TQFP-44
文件页数: 26/144页
文件大小: 1280K
代理商: ST72774S9T1/XXX
ST72774/ST727754/ST72734
121/144
PWM/BRM GENERATOR (Cont’d)
4.9.4 Register Description
4.9.4.1 PWM/BRM REGISTERS
On a channel basis, the 10 bits are separated into
two data registers:
– A 6-bit PWM register corresponding to the binary
weight of the PWM pulse.
– A 4-bit BRM register defining the intervals where
an incremental pulse is added to the beginning of
the original PWM pulse. Two BRM channel val-
ues share the same register.
Note: The number of PWM and BRM channels available
depends on the device. Refer to the device pin de-
scription and register map.
PWM[1:8] REGISTERS
Read/Write
Reset Value 1000 0000 (80h)
Bit 7 = Reserved (read as “1”)
Bit 6 = POL
Polarity Bit.
When POL is set, output signal polarity is inverse;
otherwise, no change occurs.
Bits 5:0 = P[5:0] PWM Pulse Binary Weight for
channel i .
BRM REGISTERS
BRM21 (Channels 2 + 1)
BRM43 (Channels 4 + 3)
BRM65 (Channels 6 + 5)
BRM87 (Channels 8 + 7)
Read/Write
Reset Value: 0000 0000 (00h)
Bits 7:4 = B[7:4]
BRM Bits (channel i+1)
Bits 3:0 = B[3:0]
BRM Bits (channel i)
4.9.4.2 OUTPUT ENABLE REGISTER
Read/Write
Reset Value 1000 0000 (80h)
Bit 7:0 = OE[7:0]
Output Enable Bit.
When OEi is set, PWM output function is enabled.
0: PWM output is disabled
1: PWM output is enabled
Note: From the programmer’s point of view, the PWM and
BRM registers can be regarded as being combined
to give one data value.
For example (10-bit)
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
70
OE7
OE6
OE5
OE4
OE3
OE2
OE1
OE0
0
POL
PP
PPP
P
+
B
0
POL
PPPPP
PBBBB
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