HT46R232 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT46R232 Datasheet PDF : 50 Pages
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HT46R232/HT46C232
I/O
Mode
PD0~
PD3
I/P
O/P
I/P
(Normal) (Normal) (PWM)
Logical Logical Logical
Input Output Input
O/P
(PWM)
PWM0~
PWM3
It is recommended that unused or not bonded out I/O
lines should be set as output pins by software instruction
to avoid consuming power under input floating state.
PWM
The microcontroller provides 4 channels (6+2)/(7+1) (de-
pends on options) bits PWM output shared with
PD0/PD1/PD2/PD3. The PWM channels have their data
registers denoted as PWM0 (1AH), PWM1 (1BH), PWM2
(1CH) and PWM3 (1DH). The frequency source of the
PWM counter comes from fSYS. The PWM registers are
four 8-bit registers. The waveforms of PWM outputs are as
shown. Once the PD0/PD1/PD2/PD3 are selected as the
PWM outputs and the output function of
PD0/PD1/PD2/PD3 are enabled (PDC.0/PDC.1/
PDC.2/PDC.3 =²0²), writing ²1² to PD0/PD1/PD2/PD3
data register will enable the PWM output function and writ-
ing ²0² will force the PD0/PD1/PD2/PD3 to stay at ²0².
A (6+2) bits mode PWM cycle is divided into four modu-
lation cycles (modulation cycle 0~modulation cycle 3).
Each modulation cycle has 64 PWM input clock period.
In a (6+2) bit PWM function, the contents of the PWM
register is divided into two groups. Group 1 of the PWM
register is denoted by DC which is the value of
PWM.7~PWM.2. The group 2 is denoted by AC which is
the value of PWM.1~PWM.0.
In a (6+2) bits mode PWM cycle, the duty cycle of each
modulation cycle is shown in the table.
Parameter
Modulation cycle i
(i=0~3)
AC (0~3)
i<AC
i³AC
Duty Cycle
DC+ 1
64
DC
64
fS Y S /2
[P W M ] = 1 0 0
PW M
2 5 /6 4
2 5 /6 4
2 5 /6 4
[P W M ] = 1 0 1
PW M
2 6 /6 4
2 5 /6 4
2 5 /6 4
[P W M ] = 1 0 2
PW M
2 6 /6 4
2 6 /6 4
2 5 /6 4
[P W M ] = 1 0 3
PW M
2 6 /6 4
2 6 /6 4
P W M m o d u la tio n p e r io d : 6 4 /fS Y S
M o d u la tio n c y c le 0
M o d u la tio n c y c le 1
2 6 /6 4
M o d u la tio n c y c le 2
P W M c y c le : 2 5 6 /fS Y S
(6+2) PWM Mode
2 5 /6 4
2 5 /6 4
2 5 /6 4
2 5 /6 4
M o d u la tio n c y c le 3
fS Y S /2
[P W M ] = 1 0 0
PW M
[P W M ] = 1 0 1
PW M
[P W M ] = 1 0 2
PW M
[P W M ] = 1 0 3
PW M
5 0 /1 2 8
5 0 /1 2 8
5 1 /1 2 8
5 0 /1 2 8
5 1 /1 2 8
5 1 /1 2 8
5 2 /1 2 8
P W M m o d u la tio n p e r io d : 1 2 8 /fS Y S
M o d u la tio n c y c le 0
P W M c y c le : 2 5 6 /fS Y S
5 1 /1 2 8
M o d u la tio n c y c le 1
(7+1) PWM Mode
2 5 /6 4
2 6 /6 4
2 6 /6 4
2 6 /6 4
M o d u la tio n c y c le 0
5 0 /1 2 8
5 1 /1 2 8
5 1 /1 2 8
5 2 /1 2 8
M o d u la tio n c y c le 0
Rev. 1.40
18
November 23, 2005
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