Page 163
TMP89FM42
RA001
13.5 Noise Canceller
The digital noise canceller can be used in the operation modes that use the TCA0 pin.
13.5.1 Setting
When the digital noise canceller is used, the input level is sampled at the sampling intervals set at
TA0CR<TA0NC>. When the same level is detected three times consecutively, the level of the input to the
timer is changed.
Setting TA0CR<TA0NC> to any values than "00" allows the noise canceller to start operation, regardless of
the TA0CR<TA0S> value.
When the noise canceller is used, allow the timer to start after a period of time that is equal to four times the
sampling interval after TA0CR<TA0NC> is set has elapsed. This stabilizes the input signal.
Set TA0CR<TA0NC> while the timer is stopped (TA0CR<TA0S> = "0"). When TA0CR<TA0S> is "1",
writing is ignored.
In the SLOW 1/2 or SLEEP 1 mode, setting TA0CR<TA0NC> to "11" selects fs/2 as the source clock for the
operation. Setting TA0CR<TA0NC> to "00" disables the noise canceller. Setting TA0CR<TA0NC> to "01" or
"10" disables the TCA0 pin input.
Table 13-4 Noise Cancel Time ( fcgck = 10 [MHz] )
TA0NC
Sampling interval
Time removed as noise
Time regarded as signal
00
None
-
-
01
200 ns (2/fcgck)
600 ns or less
800 ns or more
10
400 ns (4/fcgck)
1.2
µ
s or less
1.6
µ
s or more
11
25.6
µ
s (256/fcgck)
76.8
µ
s or less
102.4
µ
s or more
Содержание TLCS-870/C1 Series
Страница 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Страница 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Страница 4: ......
Страница 14: ......
Страница 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Страница 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Страница 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Страница 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Страница 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Страница 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Страница 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Страница 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Страница 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Страница 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Страница 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Страница 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Страница 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Страница 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Страница 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Страница 336: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 Note 1 Make sure that you set the C register to 0x00 LD FLSCR2 0xD5 ...
Страница 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Страница 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Страница 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Страница 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Страница 406: ...26 Package Dimensions TMP89FM42 ...
Страница 408: ......