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13. 16-bit Timer Counter (TCA)
13.4 Timer Function
TMP89FM42
RA001
13.4.2 External trigger timer mode
In the external trigger timer mode, the up counter starts counting when it is triggered by the input to the
TCA0 pin.
13.4.2.1 Setting
Setting the operation mode selection TA0MOD<TA0M> to "100" activates the external trigger timer
mode. Select the source clock at TA0MOD<TA0CK>.
Select the trigger edge at the trigger edge input selection TA0MOD<TA0TED>. Setting
TA0MOD<TA0TED> to "0" selects the rising edge, and setting it to "1" selects the falling edge.
Note that this mode uses the TA0 input pin, and the TCA0 pin must be set to the input mode beforehand
in port settings.
The operation is started by setting TA0CR<TA0S> to "1". After the timer is started, writing to
TA0MOD and TA0CR<TA0OVE> is disabled. Be sure to complete the required mode settings before
starting the timer.
13.4.2.2 Operation
After the timer is started, when the selected trigger edge is input to the TCA0 pin, the up counter incre-
ments according to the selected source clock. When a match between the up counter value and the value
set to timer register A (TA0DRA) is detected, an INTTA0 interrupt request is generated and the up counter
is cleared to "0000H". After being cleared, the up counter continues counting.
When TA0MOD<TA0METT> is "1" and the edge opposite to the selected trigger edge is detected, the
up counter stops counting and is cleared to "0000H". Subsequently, when the selected trigger edge is
detected, the up counter restarts counting. In this mode, an interrupt request can be generated by detecting
that the input pulse exceeds a certain pulse width. If TA0MOD<TA0METT> is "0", the detection of the
selected edge and the opposite edge is ignored during the period from the detection of the specified trigger
edge and the start of counting through until the match detection.
Setting TA0CR<TA0S> to "0" during the timer operation causes the up counter to stop counting and be
cleared to "0000H".
13.4.2.3 Auto capture
Refer to "13.4.1.3 Auto capture".
13.4.2.4 Register buffer configuration
Refer to "13.4.1.4 Register buffer configuration".
Summary of Contents for TLCS-870/C1 Series
Page 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 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......