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參數資料
| 型號： | HMS87C1302AD |
| 廠商： | HYNIX SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數： | 43/70頁 |
| 文件大小： | 977K |
| 代理商： | HMS87C1302AD |
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HYUNDAI MicroElectronics
HMS87C1304A/HMS87C1302A
Jan. 2001
Preliminary
43
If it needed more higher frequency of PWM, it should be
reduced resolution.
The bit POL of TM1 decides the polarity of duty cycle.
If the duty value is set same to the period value, the PWM
output is determined by the bit POL (1: High, 0: Low). And
if the duty value is set to “00
H
”, the PWM output is deter-
mined by the bit POL (1: Low, 0: High).
It can be changed duty value when the PWM output. How-
ever the changed duty value is output after the current pe-
riod is over. And it can be maintained the duty value at
present output when changed only period value shown as
Figure 12-12 . As it were, the absolute duty time is not
changed in varying frequency. But the changed period val-
ue must greater than the duty value.
Note:
If changing the Timer1 to PWM function, it
should be stop the timer clock firstly, and then
set period and duty register value. If user
writes register values while timer is in opera-
tion, these register could be set with certain
values.
Ex)
LDM TM1,#00H
LDM T1PPR,#00H
LDM T1PDR,#00H
LDM PWM0HR,#00H
LDM RBFUNC,#0001_1100B
LDM TM1,#1010_1011B
Figure 12-10 PWM Mode
Resolution
Frequency
T1CK[1:0] =
00(125nS)
T1CK[1:0] =
01(250nS)
T1CK[1:0] =
10(1uS)
10-bit
7.8KHz
3.9KHz
0.98KHZ
9-bit
15.6KHz
7.8KHz
1.95KHz
8-bit
31.2KHz
15.6KHz
3.90KHz
7-bit
62.5KHz
31.2KHz
7.81KHz
Table 12-2 PWM Frequency vs. Resolution at 8MHz
÷
1
÷
2
÷
8
PWM0HR
ADDRESS : D5H
RESET VALUE : ----0000
Bit Manipulation Not Available
-
-
-
-
PWM0HR3 PWM0HR2 PWM0HR1 PWM0HR0
-
-
-
-
X
X
X
X
MUX
1
T1CN
T1CK[1:0]
T1 (8-bit)
T1ST
0 : Stop
1 : Start
CLEAR
COMPARATOR
COMPARATOR
T1PDR(8-bit)
PWM0HR[1:0]
T1PPR(8-bit)
PWM0HR[3:2]
T1PDR(8-bit)
S
Q
R
POL
PWM0O
[RBFUNC.4]
RB4/
PWM0
T0 clock source
fxin
TM1
ADDRESS : D2H
RESET VALUE : 00000000
POL
16BIT
PWME
CAP1
T1CK1
T1CK0
T1CN
T1ST
X
0
1
0
X
X
X
X
Period High
Duty High
Slave
Master
X: The value “0” or “1” corresponding your operation.
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