參數(shù)資料
型號： MC68HC705V8FN
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數(shù)： 171/172頁
文件大?。?/td> 890K
代理商： MC68HC705V8FN
SECTION 13: PULSE WIDTH MODULATOR
MOTOROLA
Page 87
MC68HC705V8 Specification Rev. 2.1
Reads of this register will always result in the read of the PWM Data Register and not the
buffer.
Upon RESET the user should write to the data register prior to enabling the PWM system
(for example, prior to setting the PSA and PSB bits for PWM input clock rate). This will avoid
an erroneous duty cycle from being driven. During regular user mode the user should write
to the PWM Data data register after writing the PWM Control Register.
Figure 13-4:
PWM Write Sequences
13.2.1
PWM CONTROL
Figure 13-5:
PWM Control Register
PSA1, PSA0, PSB3-PSB0- PWM Clock Rate
These bits select the input clock rate and determines the period, as shown in Table 13-1.
Note that some output frequencies can be obtained with more than one combination of PSA
and PSB values. For instance a PWM output of E/512 can be obtained with either
PSA1:PSA0 = 10 and PSB3-PSB0 = 0001 or PSA1:PSA0 = 01 and PSB3-PSB0 = 1000.
This scheme allows for 38 unique frequency selections.
Table 13-1:
PWM Clock Rate
PSA1:PSA0
PSB3-PSB0
RCLK
SCLK
PWM OUT
00
xxxx
off
01
0000-1111
fosc/1
fosc/1-fosc/16
fosc/64-
fosc/1024
10
0000-1111
fosc/8
fosc/8-fosc/128
fosc/512-
fosc/8192
11
0000-1111
fosc/16
fosc/16-fosc/
256
fosc/1024-
fosc/16384
Initialize PWM Data 0
Write PWM CONTROL
OR RESET
POR
Write PWM CONTROL
Write PWM Data 1
N
Y
PSA1
--
PSB2
PSB1
PSB0
PSA0
$31
0
--
0000
0
RESET:
--
PSB3
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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