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14. 8-bit Timer Counter (TC0)
TMP89FM42
RA002
14.4.4.2 Operation
Setting T001CR<T00RUN> to "1" allows the up counter to increment based on the selected source
clock. When a match between the internal up counter value and the value set to T00PWM is detected, the
output of the
PPG0
pin is reversed. When T00MOD<TFF0> is "0", the
PPG0
pin changes from the "L" to
"H" level. When T00MOD<TFF0> is "1", the
PPG0
pin changes from the "H" to "L" level.
Subsequently, the up counter continues counting up. When a match between the up counter value and
T00REG is detected, the output of the
PPG0
pin is reversed again. When T00MOD<TFF0> is "0", the
PPG0
pin changes from the "H" to "L" level. When T00MOD<TFF0> is "1", the
PPG0
pin changes from
the "L" to "H" level. At this time, an INTT00 interrupt request is generated.
When T001CR<T00RUN> is set to "0" during the operation, the up counter is stopped and cleared to
"0x00". The
PPG0
pin returns to the level selected at T00MOD<TFF0>.
14.4.4.3 Double buffer
The double buffer can be used for T00PWM and T00REG by setting T00MOD<DBE0>. The double
buffer is disabled 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 (T00REG) during the timer operation, the
set value is first stored in the double buffer, and T00PWM (T00REG) is not updated immedi-
ately. T00PWM (T00REG) compares the previous set value with the up counter value. When
an INTT00 interrupt request is generated, the double buffer set value is stored in T00PWM
(T00REG). Subsequently, the match detection is executed using a new set value.
When a read instruction is executed on T00PWM (T00REG), the value in the double buffer
(the last set value) is read out, not the T00PWM (T00REG) value (the currently effective
value).
When a write instruction is executed on T00PWM (T00REG) while the timer is stopped, the
set value is immediately stored in both the double buffer and T00PWM (T00REG).
• When the double buffer is disabled
When a write instruction is executed on T00PWM (T00REG) during the timer operation, the
set value is immediately stored in T00PWM (T00REG). Subsequently, the match detection is
executed using a new set value. If the value set to T00PWM (T00REG) is smaller than the up
counter value, the
PPG0
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 (T00REG) is equal to the up
counter value, the match detection is executed immediately after data is written into T00PWM
(T00REG). Therefore, the timing of changing the
PPG0
pin may not be an integral multiple of
the source clock (Figure 14-10). If these are problems, enable the double buffer.
When a write instruction is executed on T00PWM (T00REG) while the timer is stopped, the
set value is immediately stored in T00PWM (T00REG).
(Example)
Operate TC00 in the 8-bit PPG mode with the operation clock of fcgck/2 and output the 8
µ
s duty pulse in 32
µ
s cycles (fcgck
= 10 MHz)
SET
(P7FC).0
; Sets P7FC0 to "1"
SET
(P7CR).0
; Sets P7CR0 to "1"
LD
(POFFCR0),0x10
; Sets TC001EN to "1"
DI
; Sets the interrupt master enable flag to "disable"
SET
(EIRH).4
; Sets the INTTC00 interrupt enable register to "1"
EI
; Sets the interrupt master enable flag to "enable"
LD
(T00MOD),0xF3
; Selects the 8-bit PPG mode and fcgck/2
LD
(T00REG),0xA0
; Sets the timer register (cycle)
; 32
µ
s / (2/fcgck) = 0xA0
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: ......