Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 11 MOTOR CONTROL FUNCTION

R01UH0042EJ0500 Rev.5.00 Page 591 of 1513

Aug 12, 2011

11.4 Operation

11.4.1 System outline

(1) Outline of 6-phase PWM output

The 6-phase PWM output mode is used to generate a 6-phase PWM output wave, by using the timer AB1 (TAB1)

and the TMQ option (TMQOPA) in combination.

The 6-phase PWM output mode is enabled by setting the TAB1CTL1.TAB1MD2 to TAB1CTL1.TAB1MD0 bits of

TAB1 to “111”.

One 16-bit counter and four 16-bit compare registers of TAB1 are used to generate a basic 3-phase wave.

The functions of the compare registers are as follows.

TAA4 can perform a tuning operation with TAB1 to generate a conversion trigger source for the A/D converter.

Compare Register Function Settable Range

TAB1CCR0 register Setting of cycle 0002H ≤ m ≤ FFFEH

TAB1CCR1 register Specifying output width of phase U 0000H ≤ i ≤ m + 1

TAB1CCR2 register Specifying output width of phase V 0000H ≤ j ≤ m + 1

TAB1CCR3 register Specifying output width of phase W 0000H ≤ k ≤ m + 1

Remark m = Set value of TAB1CCR0 register

i = Set value of TAB1CCR1 register

j = Set value of TAB1CCR2 register

k = Set value of TAB1CCR3 register

A dead-time interval is generated from the basic 3-phase wave generated by using three 10-bit dead-time counters

and one compare register to create a wave with a reverse phase to that of the basic 3-phase wave. Then a 6-

phase PWM output wave (U, U, V, V, W, and W) is generated.

The 16-bit counter for generating the basic 3-phase wave counts up or down. After the operation has been started,

this counter counts up. When its count value matches the cycle set to the TAB1CCR0 register, the counter starts

counting down. When the count value matches 0001H, the counter counts up again. This means that a value two

times higher than the value set to the TAB1CCR0 register + 1 is the carrier cycle.

10-bit dead-time counters 1 to 3, which generate the dead-time interval, count up. Therefore, the value set to the

TAB1 dead-time compare register (TAB1DTC) is used as a dead-time value as is. Because three counters are

used, dead time can be generated independently in phases U, V, and W. However, because there is only one