tmp89fm82t TOSHIBA Semiconductor CORPORATION, tmp89fm82t Datasheet - Page 315

• Manufacturer Part Number: tmp89fm82t
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Table 19-3 Relationship between Compare Register Functions and Waveform Arithmetic Circuit
PWMU waveform
PWMU waveform
[Sawtooth wave]
[Triangular wave]
wave generated by the PWM Counter (MDCNT) are compared for the relative magnitude by the comparator.
ture. The values of the PMD Compare Registers are loaded into buffer U, V, W synchronized with PWM
period.
Waveform Arithmetic Circuit
<CALCEN>
In order to produce PWM wave form, the PWM Compare Registers (CMPU/V/W) values and the carrier
The PWM Counter is a 12-bit up/down counter with a 41.7 ns (at fx = 24 MHz) resolution.
For three-phase output control, two methods of generating three-phase PWM waveforms can be set.
The three-phase PMD Compare Registers each have a comparison register to comprise a dual-buffer struc-
Note:One of the upper or lower transistors is PMD control.
0
0
1
1
EDCRA Resigter
1. Three-phase independent mode:
2. Three-phase common mode:
[MDPRD]
[MDPRD]
[CMPU]
[CMPU]
independent PWM waveforms. This method may be used to produce sine or any other desired
drive waveforms.
waveforms. This method may be used for DC brash less motor square wave drive.
MDCNT
MDCNT
Values are set independently in the three-phase PMD Compare Registers to produce three-phase
A value is set only in the U-phase PMD Compare Register to produce three in-phase PWM
n
ff
n
ff
<RWREN>
0
1
0
1
Figure 19-10 PWM Waveforms
Writing calculation re-
sults from calculation
Writing data by soft-
circuit
Write
ware
Data update
Page 299
Compare Register Access
Data update
Reading calculation results
Reading register value
Read
TMP89FM82T
Time
Time