tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 194

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

14. 8-bit Timer Counter (TC0)
RA002
Timer register 00
Timer register 01
14.4.3 8-bit pulse width modulation (PWM) output mode
T00PWM
T01PWM
(0x0028)
(0x0029)
14.4.3.1 Setting
tional pulse can be added to the 2 u n-th duty pulse. This enables PWM output with a resolution nearly equiva-
lent to 8 bits. (n=1, 2, 3...)
The pulse-width modulated pulses with a resolution of 7 bits are output in the 8-bit PWM mode. An addi-
The operation of TC00 is described below, and the same applies to the operation of TC01.
Read/Write
Read/Write
"0". Set T00MOD<EIN0> to "0" and select the clock at T00MOD<TCK0>. Set the count value to be used
for the match detection and the additional pulse value at the PWM register T00PWM.
becomes invalid. Be sure to complete the required mode settings before starting the timer.
Bit Symbol
Bit Symbol
change) in a cycle (128 counts of the source clock).
corresponds to 1 count of the source clock is added to the 2 u n-th duty pulse (n=1, 2, 3...). In other words,
the 2 u n-th duty pulse has the output of PWMDUTY+1.
After reset
After reset
TC00 is put into the 8-bit PWM mode by setting T00MOD<TCM0> to "10" and T001CR<TCAS> to
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
In the 8-bit PWM mode, the T00PWM register is configured as follows:
PWMDUTY is a 7-bit register used to set the duty pulse width value (the time before the first output
PWMAD is a register used to set the additional pulse. When PWMAD is "1", an additional pulse that
The additional pulse is not added when PWMAD is "0".
R/W
R/W
7
1
7
1
R/W
R/W
6
1
6
1
R/W
R/W
5
1
5
1
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PWMDUTY
PWMDUTY
R/W
R/W
4
1
4
1
R/W
R/W
3
1
3
1
R/W
R/W
2
1
2
1
R/W
R/W
1
1
1
1
TMP89FM42
PWMAD
PWMAD
R/W
R/W
0
1
0
1