tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 189
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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RA002
14.4 Functions
14.4.1 8-bit timer mode
they are cascaded.
width modulation output (PWM) mode and the 8-bit programmable pulse generated output (PPG) mode.
PWM mode and the 16-bit PPG mode.
14.4.1.1 Setting
14.4.1.2 Operation
14.4.1.3 Double buffer
Timer counters TC00 and TC01 have 8-bit modes in which they are used independently and 16-bit modes in which
The 8-bit modes include four operation modes; the 8-bit timer mode, the 8-bit event counter mode, the 8-bit pulse
The 16-bit modes include four operation modes; the 16-bit timer mode, the 16-bit event counter mode, the 12-bit
regularly at specified times. The operation of TC00 is described below, and the same applies to the operation of
TC01. (Replace TC00- by TC01-).
In the 8-bit timer mode, the up-counter counts up using the internal clock, and interrupts can be generated
to "0" and T00MOD<EIN0> to "0". Select the source clock at T00MOD<TCK0>. Set the count value to
be used for the match detection as an 8-bit value at the timer register T00REG.
becomes invalid. Be sure to complete the required mode settings before starting the timer.
nal source clock. When a match between the up counter value and the T00REG set value is detected, an
INTT00 interrupt request is generated and the up counter is cleared to "0x00". After being cleared, the up
counter restarts counting. Setting T001CR<T00RUN> to "0" during the timer operation makes the up
counter stop counting and be cleared to "0x00".
by setting T00MOD<DBE0> to "0" or enabled by setting T00MOD<DBE0> to "1".
TC00 is put into the 8-bit timer mode by setting T00MOD<TCM0> to "00" or "01", T001CR<TCAS>
Set T00MOD<DBE0> to "1" to use the double buffer.
Setting T001CR<T00RUN> to "1" starts the operation. After the timer is started, writing to T00MOD
Setting T001CR<T00RUN> to "1" allows the 8-bit up counter to increment based on the selected inter-
The double buffer can be used for T00REG by setting T00MOD<DBE0>. The double buffer is disabled
• When the double buffer is enabled
• When the double buffer is disabled
initially stored in the double buffer, and T00REG is not immediately updated. T00REG com-
pares the previous set value with the up counter value. When the values match, an INTT00
interrupt request is generated and the double buffer set value is stored in T00REG. Subse-
quently, the match detection is executed using a new set value.
immediately stored in both the double buffer and T00REG.
immediately stored in T00REG. Subsequently, the match detection is executed using a new set
value.
When a write instruction is executed on T00REG during the timer operation, the set value is
When a write instruction is executed on T00REG while the timer is stopped, the set value is
When a write instruction is executed on T00REG during the timer operation, the set value is
Page 175
TMP89FM42
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