Page 183
TMP89FM42
RA002
14.4.3.3 Double buffer
The double buffer can be used for T00PWM by setting T00MOD<DBE0>. The double buffer is dis-
abled by setting T00MOD<DBE0> to "0" or enabled by setting T00MOD<DBE0> to "1".
• When the double buffer is enabled
When a write instruction is executed on T00PWM during the timer operation, the set value is
first stored in the double buffer, and T00PWM is not updated immediately. T00PWM compares
the previous set value with the up counter value. When the 2
×
n-th overflow occurs, an
INTT00 interrupt request is generated and the double buffer set value is stored in T00PWM.
Subsequently, the match detection is executed using a new set value.
When a read instruction is executed on T00PWM, the value in the double buffer (the last set
value) is read out, not the T00PWM value (the currently effective value).
When a write instruction is executed on T00PWM while the timer is stopped, the set value is
immediately stored in both the double buffer and T00PWM.
• When the double buffer is disabled
When a write instruction is executed on T00PWM during the timer operation, the set value is
immediately stored in T00PWM. Subsequently, the match detection is executed using a new set
value. If the value set to T00PWM is smaller than the up counter value, the
PWM0
pin is not
reversed until the up counter overflows and a match detection is executed using a new set
value. If the value set to T00PWM is equal to the up counter value, the match detection is exe-
cuted immediately after data is written into T00PWM. Therefore, the timing of changing the
PWM0
pin may not be an integral multiple of the source clock (Figure 14-7). Similarly, if
T00PWM is set during the additional pulse output, the timing of changing the
PWM0
pin may
not be an integral multiple of the source clock. If these are problems, enable the double buffer.
When a write instruction is executed on T00PWM while the timer is stopped, the set value is
immediately stored in T00PWM.
Figure 14-7 Operation When T00PWM and the Up Counter Have the Same Value
Source clock
Counter
n-4
n-5
n-2
n
Write to T00PWM
Write n-2
PWM0 pin output
n-3
n-2
n-1
n
T00PWM
<PWMDUTY>
Match detection
T00MOD<DBE0>
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: ......