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參數(shù)資料
| 型號(hào)： | KS57C2504 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機(jī)的小型通用紅外遙控器 |
| 文件頁數(shù)： | 48/94頁 |
| 文件大小： | 763K |
| 代理商： | KS57C2504 |
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PRODUCT SPECIFICATION
S3C7254
4–48
TC0 REFERENCE REGISTER (TREF0)
TREF0 is used to store a reference value to be
compared to the incrementing TCNT0 register in
order to identify an elapsed time interval. Use the
following formula to calculate the correct value to
load to the TREF0 reference register:
TC0 timer interval = (TREF0 value + 1)
×
1
TMOD0 frequency setting
(TREF0 value
≠
0)
TC0 OUTPUT ENABLE FLAG (TOE0)
The 1-bit timer/counter 0 output enable flag TOE0 controls output from timer/counter 0 to the TCLO0 pin.
(MSB)
“0”
(LSB)
"0"
F92H
TOE0
"0"
When you set the TOE0 flag to "1", the contents of TOL0 can be output to the TCLO0 pin.
PROGRAMMING TIP — Setting a TC0 Timer Interval
To set a 30 ms timer interval for TC0, given fxx = 4.19 MHz, follow these steps.
1.
Select the timer/counter 0 mode register with a maximum setup time of 62.5 ms (assume the TC0 counter
clock = fxx/2
10
, and TREF0 is set to FFH):
2.
Calculate the TREF0 value:
30 ms = TR4.09 kHz
TREF0 + 1 = 244 μs = 122.9 = 7AH
TREF0 value = 7AH – 1 = 79H
3.
Load the value 79H to the TREF0 register:
BITS
SMB
LD
LD
LD
LD
EMB
15
EA,#79H
TREF0,EA
EA,#4CH
TMOD0,EA
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