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13. 16-bit Timer Counter (TCA)
13.4 Timer Function
TMP89FM42
RA001
13.4.6 Programmable pulse generate (PPG) mode
In the PPG output mode, an arbitrary duty pulse is output by two timer registers.
13.4.6.1 Setting
Setting the operation mode selection TA0MOD<TA0M> to "011" activates the PPG output mode.
Select the source clock at TA0MOD<TA0CK>. Select continuous or one-shot PPG output at
TA0CR<TA0MPPG>.
Set the PPG output cycle at TA0DRA and set the time until the output is reversed first at TA0DRB. Be
sure to set register values so that TA0DRA is larger than TA0DRB.
Note that this mode uses the
PPGA0
pin. the
PPGA0
pin must be set to the output mode beforehand in
port settings.
Set the initial state of the
PPGA0
pin at the timer flip-flop TA0CR<TA0TFF>. Setting
TA0CR<TA0TFF> to "1" selects the "H" level as the initial state of the
PPGA0
pin. Setting
TA0CR<TA0TFF> to "0" selects the "L" level as the initial state of the
PPGA0
pin.
The operation is started by setting TA0CR<TA0S> to "1". After the timer is started, writing to
TA0MOD and TA0CR<TA0OVE, TA0TFF> is disabled. Be sure to complete the required mode settings
before starting the timer.
13.4.6.2 Operation
after the timer is started, the up counter increments .
When a match between the up counter value and the value set to timer register B (TA0DRB) is detected,
the
PPGA0
pin is changed to the "H" level if TA0CR<TA0TFF> is "0", or the
PPGA0
pin is changed to the
"L" level if TA0CR<TA0TFF> is "1".
Subsequently, the up counter continues counting. When a match between the up counter value and the
value set to timer register A (TA0DRA) is detected, the
PPGA0
pin is changed to the "L" level if
TA0CR<TA0TEFF> is "0", or the
PPGA0
pin is changed to the "H" level if TA0CR<TA0TFF> is "1". At
this time, an INTTA0 interrupt request occurs. If the PPG output control TA0CR<TA0MPPG> is set to
"1" (one-shot), TA0CR<TA0S> is automatically cleared to "0" and the timer stops.
If TA0CR<TA0MPPG> is set to "0" (continuous), the up counter is cleared to "0000H" and continues
counting and PPG output. When TA0CR<TA0S> is set to "0" (including the auto stop by the one-shot
operation) during the PPG output, the
PPGA0
pin returns to the level set in TA0CR<TA0TFF>.
TA0CR<TA0MPPG> can be changed during the operation. Changing TA0CR<TA0MPPG> from "1" to
"0" during the operation cancels the one-shot operation and enables the continuous operation. Changing
TA0CR<TA0MPPG> from "0" to "1" during the operation clears TA0CR<TA0S> to "0" and stops the
timer automatically after the current pulse output is completed.
Timer registers A and B can be set to the double buffer. Setting TA0CR<TA0DBF> to "1" enables the
double buffer. When the values set to TA0DRA and TA0DRB are changed during the PPG output with the
double buffer enabled, the writing to TA0DRA and TA0DRB will not immediately become effective but
will become effective when a match between TA0DRA and the up counter is detected. If the double buffer
is disabled, the writing to TA0DRA and TA0DRB will become effective immediately. If the written value
is smaller than the up counter value, the up counter overflows. After a cycle, the counter match process is
executed to reverse the output.
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: ......