參數(shù)資料
型號(hào)： MC68HC916X1
廠商： Motorola, Inc.
英文描述： 16-Bit Modular Microcontroller(16位模塊化微控制器)
中文描述： 16位微控制器模塊（16位模塊化微控制器）
文件頁數(shù)： 99/172頁
文件大?。?/td> 1035K
代理商： MC68HC916X1
MC68HC916X1
MC68HC916X1TS/D
MOTOROLA
99
PPR[2:0] — PWM Prescaler/PCLK Select
This field selects one of seven prescaler taps, or PCLK, to be PWMCNT input. Refer to
Table 51
.
SFA/B — PWMA/B Slow/Fast Select
0 = PWMA/B period is 256 PWMCNT increments long.
1 = PWMA/B period is 32768 PWMCNT increments long.
Table 52
shows the effects of settings on PWM frequency for a 16.78-MHz system clock.
F1A/B — Force Logic Level One on PWMA/B
0 = Force logic level zero output on PWMA/B pin
1 = Force logic level one output on PWMA/B pin
PWMA/PWMB
— PWM Duty Cycle Registers A/B
These registers are associated with the pulse-width value of the PWM output on the corresponding
PWM pin. A value of $00 loaded into one of these registers results in a continuously low output on
the corresponding pin. A value of $80 results in a 50% duty cycle output. Maximum value ($FF) se-
lects an output that is high for 255/256 of the period.
$YFF926, $YFF927
PWMCNT
— PWM Count Register
PWMCNT is the 16-bit free-running counter associated with the PWM functions of the GPT module.
$YFF928
PWMBUFA/B
— PWM Buffer Registers A/B
These read-only registers contain values associated with the duty cycles of the corresponding
PWM. Reset state for both registers is $00.
$YFF92A, $YFF92B
PRESCL
— GPT Prescaler
The 9-bit prescaler value can be read from bits [8:0] at this address. Bits [15:9] always read as ze-
ros. Reset state is $0000.
$YFF92C
Table 51 PWM Prescaler/PCLK Select Taps
PPR[2:0]
System Clock
Divide-By Factor
2
4
8
16
32
64
128
PCLK
000
001
010
011
100
101
110
111
Table 52 Effects of SFA/B Settings on PWM Frequency
PPR[2:0]
000
001
010
011
100
101
110
111
Prescaler Tap
Div 2 = 8.39 MHz
Div 4 = 4.19 MHz
Div 8 = 2.10 MHz
Div 16 = 1.05 MHz
Div 32 = 524 kHz
Div 64 = 262 kHz
Div 128 = 131 kHz
PCLK
SFA/B = 0
32.8 kHz
16.4 kHz
8.19 kHz
4.09 kHz
2.05 kHz
1.02 kHz
512 Hz
PCLK/256
SFA/B = 1
256 Hz
128 Hz
64.0 Hz
32.0 Hz
16.0 Hz
8.0 Hz
4.0 Hz
PCLK/32768
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